Purchasing power parities (PPPs) are the rates of currency conversion that try to equalise the purchasing power of different currencies, by eliminating the differences in price levels between countries. This could greatly increase in app purchases for Asian Markets. One might say one can use VPN to change their country location and get things for cheap -- solution: the currency/country can easily be found out from the bank it's being paid through. No one can fake their bank account which they pay from.