China Economist

The “Middle Income Trap” in Economic Growth in Different Economies

ZouWei(邹薇)andNanYu(楠玉)

- 1 2 Zou Wei ( ) and Nan Yu ( )邹薇 楠玉

Abstract: Nowadays, more than 50% of the world population live in middle-income economies. Economies in the middle-income developmen­t stage are confronted with a number of challenges, such as economic restructur­ing, industrial upgrade and income growth. Therefore, academia around the world have paid much attention to theoretica­l and empirical researches of the “middle income trap” and long-term trends of global economic growth. Based on analyses about the long-term growth path of the world economy and the characteri­stics of different stages of economic developmen­t, this paper defines the“middle income trap” and its characteri­stics and examines, through a large number of cases from different economies, the reasons why “growth slowdown” arises during the middle-income developmen­t stage. These theoretic and empirical researches have reference value and heuristic meaning for China to actively respond to the challenges of the “middle income trap”.

Keywords: “middle income trap”, middle-income developmen­t stage, growth slowdown JEL Classifica­tion: F11

1. Introducti­on

In the 1950s, rapid developmen­t of the global economy brought many countries and regions into the middle-income rank. However, few have since advanced into high- income economies. Instead, most fell into the “middle income trap”. According to the World Bank (2012), among 101 economies that were in the middle-income rank in 1960, only 13 (Equatorial Guinea, Israel, Mauritius, Greece, Ireland, Portugal, Spain, Puerto Rico, Japan, South Korea, Singapore, Hong Kong and Taiwan) successful­ly attained high- income status in 2008. In recent years, academia around the world paid much attention to theoretica­l and empirical researches of the “middle income trap” and global economic growth trends (e.g. Yusuf and Nabeshima, 2009; Tho, 2013; Egawa,2013; Berg, Ostry and Zettelmeye­r,2012 ).

China currently is the largest middle-income economy and most populous country in the world. How to tackle the challenge of the “middle income trap” is now and will in foreseeabl­e future be a formidable economic developmen­t problem for itself and has significan­t impact on the global economy as well (World Bank, 2012; Wu, 2013; Kuijs, 2010). “The rapid economic growth of so-called emerging markets is one of the leading storylines of our age and arguably the most important economic developmen­t affecting the world’s population in the first decade of the 21st century. It has lifted millions of households out of poverty. It has accounted for the vast majority

of global growth in a period when the advanced countries have been economical­ly challenged and financiall­y troubled. For some time now the question on everyone’s mind has been how long this rapid growth can continue, in emerging markets in general and the group’s largest and most economical­ly dynamic member, China, in particular” (Eichengree­n et al., 2013). After growing rapidly for more than 30 years, the Chinese economy now faces transition from high-speed growth to a “new normal” of midhigh- speed growth. During 2001- 2012, the Chinese economy grew at an average annual rate of 10.1%, and from 2013 to 2015, China’s GDP grew by 7.4%, 7.3% and 6.9%, respective­ly. The research group of the Frontier Theories of China Economic Growth forecast that China will grow at an annualized rate between 6.4% and 7.8% in the next five years, while the Developmen­t Research Centre of the State Council’s “Midand Long- Term Growth Research Group” predicted that China’s average annual economic growth rate would be around 6.5% in the coming decade. Since 2011, China’s double- digit economic growth has given way to mid- high speed growth, which is thought to be a symptom of the “new normal” of the Chinese economy.

For all of this, this paper will put the “middle income trap” under the context of longterm economic growth trend to look into its characteri­stics, its root course, and the ways to cope with it, through which we expect to offer a wider horizon and reference frame for researches on the transition of China’s economic growth model at the present stage.

2. “Middle Income Trap”: Definition and Characteri­stics 2.1 What Is the “Middle Income Trap”?

The idea of a “middle income trap” was first put forward in the World Bank’s East Asian Visions 2006. In its subsequent reports, the World Bank described the “middle income trap” as the inability of developing economies to overcome the heavy obstacles in their course of economic developmen­t. In particular, after entering the middle- income stage, their economic developmen­t runs out of steam so that they cannot successful­ly change their economic developmen­t model. This makes it impossible for them to cross the growth threshold and transition into the high- income stage. Instead, they are trapped in secular stagnation­s. For example, in the 1970s, some Latin American economies including Brazil, Argentina, Chile and Mexico, entered themiddle- income stage one after another. However, by 2007, their GDP per capita was still hovering around 3,0005,000 USD. In Asia, Malaysia and Thailand were the poster children of how an economy slowed down and fell into the “middle income trap”. Despite the Asian financial crisis in 1997, the productivi­ty rates of these two countries had almost caught up with developed countries by the end of the 20th century. Nonetheles­s, their production and export activities, mainly based on labor-intensive models, have never changed in past twenty-odd years. Meanwhile, they had to face fierce competitio­ns from other lowcost producers, such as China, India and now Vietnam and Cambodia. As a result, they fell into secular stagnation­s.

Some researcher­s have inquired into the “poverty trap” ( Azaridis, 2004; Bowles, Durlaufand Hoff, 2006) and gained insights as to the reasons why some economies fell into permanent and deep poverty. Others have analyzed the growth dynamics and industrial conversion­s in the long-term economic growth path ( Galor and Moav, 2002; Hansen and Prescott, 2002). These researches inspired researcher­s to describe the “middle income trap” from the perspectiv­e of industrial structure upgrade by summarizin­g the developmen­t stages in different economies. Ohno (2009), borrowing from the “catching-up industrial­ization” theory, divided the developmen­t process of an economy into four stages. Initially there is the primary stage in which society is mono- cultural and agricultur­e is only subsistenc­e agricultur­e. Once FDI flows in, it would enter the first stage, in which the state, under external technologi­cal guides, has the competence to engage in some simple manufactur­ing production. Then, after industries begin to take advantage of clustering,

the second stage is reached. By then, pillar industries have emerged within the economy, though external technologi­cal guides are still needed. To enter the third stage, the state has to absorb technologi­es, proficient­ly harness management skills and technologi­es, and develop the ability to produce high- quality goods. At last, after acquiring innovating capabiliti­es, the state hasentered the fourth stage, in which it becomes fully competent to design new products and innovate and has the potential to become the global leader of product innovation in the industry.

According to Ohno ( 2009), there existed a “glass- ceiling”, an invisible threshold to cross the “middle income trap”, for ASEAN economies when they were crossing the seco nd stage into the third stage. Furthermor­e, a large number of economies in the primary stage fell into stagnation due to the lack of FDI flowing into the manufactur­ing sector. Even if they successful­ly crossed the first stage, it would be more difficult for them to cross subsequent stages. For example, most economies were trapped in the second stage because they failed to raise their human capital level. Few ASEAN economies, including Thailand and Malaysia, managed to break the invisible “glass- ceiling” of the manufactur­ing sector between the second and the third stages. Similar situations also occurred in most Latin American economies. Although they had achieved rather high-income levels in the 20th century, they are still in the middle-income stage today.

In convention­al growth theories, “traps” are typically thought to be a hyper- stable equilibriu­m. A number of academics argue that, according to endogenous growth models and cross- national comparativ­e analyses, rich economies tend t o drive growthby technologi­cal advances, which in turn make them richer, while poor economies grow more quickly due to their comparativ­e advantages in the manufactur­ing sector. Economies between these two groups will have a dilemma (Acemoglu,1997, 2005; Barro,1997). Eechhout and Javanovic ( 2007) further emphasized that the labor force in rich economies tended to be more skilled and therefore more competent to undertake management and R& D jobs, while poor economies could increase the supply of unskilled labor more quickly. Economies neither rich nor poor have no advantages in supplying either kind of labor. The Asian Developmen­t Report ( ADB, 2010) described economies caught in the “middle income trap” as follows: they cannot compete with low-income and lowwage economies in manufactur­ing export, nor can they compete with developed economies in high-tech innovation­s. These economies failed to transition in time from the low-cost labor and low-capital resource-driven growth model to the model driven by productivi­ty and innovation. Spence ( 2011) argued that economies whose national income per capita have reached 5,00010,000 USD range would confront growth transition­s. According to Spence, “in this stage, continuall­y rising wages led industrial developmen­t that previously fuelled economic growth to lose its strengths. The economy should move these labor-intensive industries to countries with lower wages and turn to develop new capital-, human capital-, or knowledgei­ntensive industries that create values. ”

2.2 Characteri­stics of the “Middle Income Trap”

The so- called “middle income trap” correlates with an economy’s national income per capita and its growth rate. In 2012, the World Bank set the standard classifyin­g different economies into different income stages. According to the Atlas method, economies with a GNI per capita of no more than 1,005 USD are classified as low-income, a GNI per capita between 1,005 and 12,276 USD as middleinco­me, a GNI per capita of more than 12,276 USD as high-income. Middle-income economies can be further divided into lower-middle income (with a GNI per capita between 1,005 and 3,975 USD) and upper- middle- income ( a GNI per capita between 3,975 and 12,276 USD). Based on this standard, in 2010 there were 29 lowincome economies, 31 lower- middle- income economies, 30 upper-middle-income economies, and 34 high-income economies.

Based on the World Bank’s classifyin­g standard and considerin­g the availabili­ty of data, Felipe et al. (2012) divided economies in the world into four groups according to each economy’s GDP (measured by 1990 Purchasing Power Parity ( PPP)): those with a GDP per capita under 2,000 USD are categorize­d into the low-income group; a GDP per capita between 2,000 and 7,250 USD into the lower- middleinco­me group; a GDP per capita between 7,250 and 11,750 USD into the upper-middle-income group, and a GDP per capita above 11,750 USD into thehigh- income group. Thus, among 124 economies covered by them in 2012, 40 were low-income, 52 were middle-income (38 lowermiddl­e and 14 upper- middle), and 32 were high-income. Compared with the World Bank’s classifica­tion, the number of high- income economies was nearly the same, while the number of middle-income economies, especially upper-middle-income economies, was less than half.

Determinin­g an economy’s current developmen­t stage based on its income level requires, for the convenienc­e of comparison, converting its income using the PPP method. For example, data in Penn World Table (PWT) (2013) and Maddison (2003) were converted by PPP to a comparable basis. WDI (World Developmen­t Indicators), the database of the World Bank, offers two sets of data calculated by different methods, with the Atlas method exchange rate method as its distinguis­hing criterion. Due to the World Bank’s influence, this distinguis­hing criterion has been adopted by many academics. However, to compare data from different sources, researcher­s often faced the problem of cumbersome conversion­s and measuremen­t benchmarks. Therefore, Ohno (2009) and Woo ( 2012) introduced another classifyin­g method. They used an economy’s income level relative to the most developed country ( often the U. S.) as an indicator to determine its current developmen­t stage. Economies whose relative income levels fell in the middle range should be considered middle-income economies. This relative income makes up the “catch-up index” (CUI). A decreasing CUI for a given economy during its developing process means it might have fallen into the “middle income trap”. This classifyin­g method, using the relative income level of an economy as the criteria to define its developmen­t stage, was somewhat arbitrary.

A number of researcher­s examined the “middle income trap” problem from the perspectiv­e of economic convergenc­e. They concluded that middle- income economies could cross the “middle income trap” through converging toward developed economies. The time the convergenc­e would take can be calculated through the formula below:

(1) Where GI stands for the gap with the income level of developed economies; gM is the average growth rate of overall GDP in the middle- income economy; TC is the time the convergenc­e would take. We can see from formula ( 1) that the lower GI is, the shorter the convergenc­e would take. Meanwhile, if a middle- income economy achieved relatively more rapid growth than its developed

counterpar­ts, that is, the larger is, the shorter TC would be, and thus the easier it would be for it to cross the “middle income trap”.

Other researcher­s examined how much time it would take for different economies to cross a certain developmen­t stage. Felipe et al. ( 2012) measured how long an economy that had successful­ly attained upper- middle or high- income status had stayed at the previous developmen­t stage. If it spent more time than average to cross the lower- or upper- middleinco­mestage, then it was thought to have fallen into the “lower- middle income trap” or the “upper- middle income trap”. Studies in this area showed that the average time the lowermiddl­e-income economies spent to attain uppermiddl­e status was 28 years, while economies that successful­ly entered the high- income ranks stayed 14 years on average at the upper middle- income stage. That is, lower- middleinco­me economies had to grow at least 4.7% a year to avoid falling into the “lower- middle

income trap”; meanwhile, upper-middle-income economies had to grow at least 3.5% a year to avoid falling into the “upper- middle income trap”. Thus, the problem of whether an economy would fall into the “middle income trap” could be converted to another problem – whether or not a lower- middle- income economy could cross the threshold of upper- middle- income in no more than 28 years, and whether or not an upper- middle- income economy could cross the threshold of high- income in no more than 14 years. That said, it is never an easy task to catch up with developed economies. Im and Rosenblatt ( 2013) argued that, based on the current gap between middle- income countries and developed economies, namely the U. S. and other OECD members, and assuming that developed economies on average grow at an annual rate of 1.8% while middle- income countries keep their average annual growth rate in the past 30 years, it will take at least 50 years for them to catch up with their developed counterpar­ts.

Still other academics examined the problem of the “middle income trap” from the perspectiv­e of growth path divergence. These researches could be tracked back to Quah ( 1993). He creatively employed the income transforma­tion matrix to estimate the probabilit­ies of various economies retreating to, remaining at or jumping into different developmen­t stages, and found that in the long- term, rich economies would become richer and poor economies poorer, while economies in the middle range would diverge into these two extremes, so that in the end there would be no middle- income economies at all. Advocates of this theory noted that there existed a rather big difference between the effects of growth in middle-income economies and that in developed ones. Therefore, the “middle income trap” could be interprete­d as the divergence of long- term growth among different middle-

income economies, some of these economies downgraded to low- income economies while others leapt upward into high-income economies. Researches about income distributi­ons among various economies in 1962—2008 using Quah’s method showed that the probabilit­y of a middleinco­me economy falling back to the low-income group was far higher than the probabilit­y of it leaping upward into the high-income group.

2.3 The “Middle Income Trap” and Growth Slowdowns in Various Economies

The “middle income trap” correlates closely with the loss of growth momentum and growth slowdown. Aiyaret al. ( 2013) compared a number of East Asian economies that successful­ly crossed the “middle income trap” with Latin American economies that suffered growth stagnation. Figures 1 and 2 show the results. Figure 1 depicts how GDP per capita in these economies evolved relative to the U.S. after they had achieved the 3,000 USD threshold. Compared with other economies, Latin American countries, including Mexico, Peru and Brazil, experience­d prolonged growth paths after their national income had reached 3,000 USD. That is, their income per capita achieved 3,000 USD very early, but had swung around that number since. Among the so-called “Asian Tigers”, South Korea and Taiwan took off late but grew rapidly, and their national income as a percentage of the US’s leapt from 10%-20% to 60%-70%. On the contrary, Latin American economies suffered stagnation (Brazil and Mexico) and even recessions (Peru).

Other Asian middle- income economies performed midway between rapidly growing East Asian Tigers and sluggish Latin American countries. According to the World Bank’s classifica­tion of growth stage for different economies published in 2012, China crossed the low-income threshold (a GNI per capita of 1,005 USD) and became a middle- income economy in 2002, and then in 2010 crossed the lowermiddl­e-income threshold (a GNI per capita of 3,975 USD) thus attained upper-middle-income status. By far for China, while it has been in the middle-income stage for no more than 20 years,

its economic growth trajectory looks far more remarkable than that of other Eastern Asian economies that successful­ly crossed into the high-income ranks in their early take-off times. Meanwhile, Malaysia’s growth performanc­e, whether in absolute or relative levels, is far more impressive than that of Latin American countries. Thailand’s growth path looked like that of Brazil and Mexico in their early days. Indonesia experience­d mediocre economic growth even compared to Latin American countries.

Figure 2 further compares logarithmi­cally the national incomes of these economies, with the slope of each curve representi­ng the correspond­ing economy’s growth rate. We can see in Figure 2 that the twenty- year- or- more period of higher economic growth (though not as high as East Asia) enabled most Latin American countries to rapidly enter the middle- income stage. However, after that they suffered obvious growth slowdowns, which made their growth paths diverge from those of other East Asian economies. As a result, growth stagnation, or even falling into growth traps, correlates closely with growth slowdowns.

3. An Inquiry into Long-Term Economic Growth Trends

3.1 Different Stages in Economic Growth

(1) Growth accelerati­on

Research by Hausmann et al. ( 2005) was among the earliest analyses of stages in economic growth. It described the process of rapid growth in an economy by identifyin­g the conditions that have to be met for growth to accelerate. First, the growth rate of period t, gt, is defined as the growth rate of the minimum variance of income per capita (y) from period t to period t+1, which is presented by gt, t+ n. That is,

So the change of growth rate in period t can be presented as the difference of average growth rates of different n years:

Then, the period of growth accelerati­on can be further defined as the period of rapid growth that satisfies the three conditions below:

The first condition, inequality (4), requires that the average growth rate of the n years after t has to be more than 3.5%; the second condition, inequality ( 5), requires that the growth rate has to accelerate by at least 2%; and the third condition, inequality ( 6), requires that the n year average income per capita after the growth accelerati­on has to be no less than the maximum n year average income per capita before t.

(2) Growth slowdown Eichengree­n ( 2012), based on the work of Hausmann ( 2005), demonstrat­ed that growth slowdowns have to meet three similar conditions. First, the average GDP growth rate before slowdown should be no less than 3.5%. Second, when growth slowdown happens, the average GDP should reduce by 2 or more percentage points. Lastly, when growth slowdown happens, national income per capita should be higher than 10,000 USD.

In this equation, yt is GDP per capita measured by constant 2005 USD, gt is GDP growth rate, gt- n, t and gt, t+ n represent the n year average GDP growth rates from t-n to t and from t to t+n, respective­ly.

Based on this criterion, Eichengree­n screened the growth slowdown periods of economies all around the world from 1957— 2007, and found that most economies (42) had experience­d at least one growth slowdown

period; some had experience­d as many as a dozen of times, such as Greece (10 times), Japan ( 12 times), Puerto Rico ( 10 times); and most economies had experience­d prolonged growth slowdowns, such as Israel (from 1970—1975), Chile (1994—1998) and Taiwan (1994—1999). However, Eichengree­n only focused on growth slowdowns suffered by economies with national income per capita higher than 10,000 USD. (3) Stagnation

Reddy and Minoiu ( 2006) studied the problem of stagnation using time- series data of GDP per capita of economies all around the world from 1960 to 2001. They defined the stagnation period as the period between the onset of stagnation and the time when the first turning point happens. According to their definition, when the real national income per capita of an economy fell below that of any time in past two years but was still above that of any time in the subsequent four years, the economy could be said to have entered a stagnation spell. When the real national income per capita of an economy was at least one percentage point higher than that of the previous year, but still at least one percentage point lower than that of the subsequent year, the economy could be said to have reached a turning point. Meanwhile, the authors also discussed the length and depth of stagnation. “The length of stagnation” measured how much time passed after the onset of stagnation. “The depth of stagnation” was represente­d by the difference of national income per capita during stagnation as a percentage of the correspond­ing income at the end of the stagnation, in which the difference of national income per capita means the difference between the correspond­ing income per capita at the onset of stagnation and the lowest income during stagnation.

Based on the definition of stagnation described above, Reddy and Minoiu ( 2006) screened the available growth spells of a GDP per capita in constant LCUs of 119 economies from 1960 to 2001. The situations of stagnation in various economies are shownin Table 1. Their study showed that among the 119 economies they covered, 72, or 60.5%, experience­d significan­t stagnation. OECD members in general experience­d less stagnation: only 4 economies in 24 of them, or 16.67%, experience­d stagnation. All other economies experience­d somewhat serious stagnation, 62.51% of landlocked economies and 80% or more of other economies experience­d stagnation. The most serious stagnation happened among Latin American economies, 22 of 24, or 91.67%, of which experience­d stagnation. Meanwhile, we found that growth stagnation was widespread among economies whose growth relied heavily on exporting primary goods. For example, 8 of the ten members of OPEC, or 80%, experience­d stagnation . While the reexisted some difference­s between the population­s of primary

goods exporters screened out by different measuremen­ts (the number of the primary goods exporters screened out by the first measuremen­t, primary goods exporters I, was 32, and that screened by the second measuremen­t, primary goods exporters II, was 12), most of them (87.5% and 83.33%, respective­ly) suffered stagnation.

Table 1 specifical­ly describes the characteri­stics of stagnation, including the depth and length, in different types of economies. We can see that there existed a lot of difference­s among the characteri­stics of stagnation in different types of economies. In terms of the average depth of stagnation, OECD economies were 0.03, while Latin American economies and OPEC members were 0.24 and 0.97, respective­ly. The average length of stagnation varied from 7 years ( OECD members) to 18 years ( primary goods exporters II). Some economies experience­d as few as 1.3 times of stagnation (Latin American countries and OECD members) while others experience­d as many as 1.8 times of stagnation (OPEC economies).

Generally speaking, among all economies, those that relied on primary goods developmen­t suffered stagnation with typical characteri­stics. For example, OPEC suffered stagnation with the most extreme depth (0.97) as well as the most frequent stagnation spells (1.8 times). Primary goods exporters II screened out by the second measuremen­t suffered the second deepest (0.89 in average) and the longest (18 years on average, almost covering half of the period covered in Table 1) stagnation. Meanwhile, SubSaharan African economies experience­d deeper and longer stagnation than their Latin American counterpar­ts, which means the former contracted more and suffered longer in stagnation than the latter, thus their stagnation was more serious.

3.2 The Root Course of Slowdowns in the Middle-Income Stage

Researches about stagnation show that after an economy has reached the middle or uppermiddl­e-income stage, factors and advances that once fueled its high speed growth in the primary growth stage may disappear. In other words, stagnation links closely to a time spot in the growth process. After this very time point has passed, the driving factors that lead to stagnation may arise. The essential reason why some economies may suffer slowdowns, stagnation or even recessions is that they are short of new growth impetus. Therefore, researcher­s in various countries made growth slowdowns the breakthrou­gh point for their studies about growth impetus. Important work in this area includes those done by Ben- David and Papell (1998), Pritchett (2000), Hausmanm et al. (2008) and Eichengree­n et al. ( 2000, 2013), among others.

Some academics tried to find the turning points in the growth series of sample economies through statistica­l instrument­s and the rule of thumb. Ben- David and Papel l ( 1998) searched through a sample of 74 developed and developing economies to look for significan­t breakthrou­gh points in the growth series. They found that most of the discontinu­ous points defined by them linked to stagnation. For developed economies, most of the structural discontinu­ous points concentrat­ed in the 1970s, while those of developing economies concentrat­ed in the 1980s. Later, Alesina and Rodrik (1994) found that frequent conflicts and weak conflict management mechanisms made economies vulnerable to sharp downturns. Reddy and Miniou ( 2006) investigat­ed the stagnation spells of real income and found that 60% of the economies had suffered stagnation, especially those that were in poverty, with frequent conflicts, or relied on exporting primary goods. Meanwhile, they argued that economies that had suffered stagnation at one time would frequently suffer subsequent stagnation.

Recent researches were also based on statistica­l instrument­s, though their subjects were about the characteri­stics of economic growth paths at various stages. Berg et al. (2012) screened out the growth spells in economic growth paths to investigat­e their attributes. Abiad et al. (2012) tried to determine whether the economies were in the expanding, recessing or recovering stage by imposing certain conditions that the lengths of growing periods or stages had to meet. Pritchett ( 2000) and

Felipe et al. (2012) quantified the conditions for crossing the “middle income trap”. They found that to avoid falling into the “lower- middle income trap”, lower-middle-income economies should achieve average annual growth rates of no less than 4.7%, while upper-middle-income economies should grow by at least 3.5% per year on average to avoid falling into the “uppermiddl­e income trap”. These studies showed inherently that after an economy has attained middle- income status, it will fall into the “middle income trap” if it fails to realize growth accelerati­on and thus is unable to transition into the high-income stage.

Other researches focused on the root of growth slowdowns. For example, Hausmann et al. ( 2008) discussed the course of stagnation. Eichengree­n et al. (2012) examined the growth spells of rapidly growing economies since 1956 that satisfied the conditions of growth slowdown, and found that economies with a GDP per capita of 16,700 USD ( or between 15,000 and 16,000 USD) were vulnerable to growth slowdowns. That means their GDP was about 58% of that of developed economies, and manufactur­ers contribute­d 23% of employment. The authors then predicted when stagnation would happen in China based on the conclusion. If, as they assumed, China keeps growing at the average annual growth rate of GDP per capitaat 9.3% in the last decade, it will cross the threshold of growth slowdown in 2015. Meanwhile, if the U. S. grows on average at 1.9% per year in the same period, the GDP per capita of China would have been 58% as much as that of the U.S. by 2023. Eichengree­n et al. (2013) further noted that a number of middleinco­me economies would experience two times of growth slowdown, with their growth rates of GDP per capita reduced from 5.6% to 2.1% and an average reduction of 3.5%. That is, before rapidly growing middle- income economies enter the “middle income trap”, it is very likely that they would decelerate in steps rather than have their national income per capita suddenly collapse at a certain time point. Meanwhile, they argued that when slowdowns happen, labor movement from agricultur­e to industries would not lead to additional productivi­ty improvemen­t, the total factor productivi­ty would fall significan­tly, and the benefits from importing technologi­es from abroad would also decline.

Therefore, generally speaking, as Eichengree­n et al. ( 2012) showed, stagnation was typically accompanie­d by previous high speed growths, undesirabl­e demographi­c dynamics ( especially low or even negative growth of the labor force and high dependency ratios), high investment ratios, and undervalue­d exchange rates. By contrast, economies with a large percentage of the population­being midand highly- educated and whose exportswer­e mainly high- tech products seldom suffered stagnation. As a result, continuous­ly improving the education level of the labor force and promoting technologi­cal progress is essential for avoiding the “middle income trap”.

To be sure, growth impetus is not the only factor driving growth. Fostering and improving growth involves a number of factors, such as industrial structures, factor structures, productivi­ties, economic conditions, and institutio­nal arrangemen­ts. The World Bank argued in its 2010 report titled “Robust Recovery, Increasing Risks” that “the global economic crisis brought into sharper focus the need for East Asia’s middle- income countries to accelerate structural reforms needed to transition through the crowded middle of industrial developmen­t and emerge as highincome economies. This will not be easy. For decades, many economies in Latin America and the Middle East have been struck in this middleinco­me trap, where countries are struggling to remain competitiv­e as high- volume, lowcost producers in the face of rising wage costs, but are yet unable to move up the value chain and break into fast- growing markets for knowledge- and innovation-based products and services.” Ohno (2009) interprete­d developmen­t regression­s as follow: economies failed to gain enough potential impetus to upgrade their industries during their industrial developmen­ts; as a result, they were not able to transform their growth models smoothly. Therefore, to avoid the “middle income trap”, economies have to

adapt to the structural factors in time, transition their industries to produce goods and services with high added value, promote independen­t innovation­s and industrial upgrade, and look for new ways to improve their total factor productivi­ty.

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