There's nothing like a new Apple gadget to test consumer appetites, or to illustrate the enduring wage disparity between men and women. 

Bloomberg crunched the latest U.S. median pay data and factored in the retail cost of an iPhone 6s Plus to create the iPhone Gender Pay Gap index. The results show that across an array of professions from bartenders to CEOs, women on average must work eight extra hours, or a full day, to be able to buy the same product. 

Our index used U.S. Census Bureau data measuring median earnings across 299 occupations, comparing men and women in full-time, year-round jobs. 

The gap is greatest among restaurant and coffee shop hosts, where women must work 27.85 additional hours, or 47 percent longer, than their male colleagues to afford the same iPhone. 

Agricultural engineers were closest to achieving pay grade equality, with female engineers working 19.28 hours to afford an iPhone, compared with male engineers’ 19.23 hours of work. 

In which field does it pay to be a woman? Turns out female crossing guards can work nearly nine hours less than their male counterparts to afford an iPhone. Women also make more than male colleagues as tour guides, nuclear technicians, game wardens and models.

Since its introduction in 2007, the iPhone has become a consumer staple in some households. Last week, a study by UBS Group AG also used the iPhone (and the McDonald's Big Mac) as a benchmark to compare purchasing power, not across genders but across 71 cities around the world. Their findings showed that in New York City, on average, one can spend less than three days on the job to buy an iPhone, while in Kiev one can afford the same device only after more than 13 weeks of work.

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