PPP becomes meaningless when you try to buy international standard products or services which are almost always priced in USD, irrespective of purchasing parity.

This also holds true for products and services which are needed for professional skill development and their upkeep. The massive disparity between some countries’ PPP and nominal revenue/income is foolishly portrayed by some economists as a good thing, but at an individual level it’s a huge disadvantage.

Where it is relevant is groceries, fully local services and products.