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Re:Ask HN: Xray cost – USA $200 (13000 INR), India 1000 INR ... by jogjayr on Wednesday September 27, 2017 @11:46PM (#15354392)
Who said anything about saving in the US to spend in India? Saving in the Bay Area to spend in rural Montana is an equally valid comparison, cost-of-living wise.

The point I was making is that some things cost the same no matter where you live. The Indian dentist who wants to take a foreign vacation, buy an iPhone, or a car needs to spend more, relative to her income, than the American dentist. Purchasing power only holds for things that are labor-bound (mainly services, and goods that are labor-intensive to manufacture) rather than resource-bound.

Re:Ask HN: Xray cost – USA $200 (13000 INR), India 1000 INR ... by zaptheimpaler on Thursday September 28, 2017 @09:16PM (#15362065)
Purchasing power is based on a basket of goods for the average consumer. It takes into account expenses like phones and cars - as you say, iPhones are still expensive but the basket would take that into account and purchasing power would be lowered accordingly.