Delv­ing deep How we compiled the data

The Daily Telegraph - Business - - Business -

The Tele­graph tracked on­line flight prices be­tween June 24 and July 9 from any Lon­don air­port to common des­ti­na­tions, us­ing the cheap­est econ­omy op­tion for two adult pas­sen­gers for equiv­a­lent pe­ri­ods in July and Septem­ber. Data for our bas­ket anal­y­sis was cal­cu­lated from prices listed on PriceSpy, a web­site that logs the costs of a wide range of goods of­fered by re­tail­ers in Bri­tain. To build our bas­kets, we first or­gan­ised in­di­vid­ual prod­ucts into broader cat­e­gories – e.g. painkiller­s, blenders or drills – and in turn placed these into bas­kets that rep­re­sented dif­fer­ent ar­eas of life. We then se­lected a sam­ple of prod­ucts for each cat­e­gory and cre­ated a com­par­i­son only us­ing those prod­ucts with prices avail­able at the be­gin­ning of the year.

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