The Purchasing Power Parity (PPP) Method

The purchasing power parity (PPP) method

A) calculates the cost of purchasing a specific bundle of goods and services in each country and uses this measure to convert the incomes of different countries to a common currency.
B) calculates how much the general price level has increased within one specific country through time.
C) calculates how much the average standard of living across all countries has changed through time.
D) is used when one wants to compare dollar values from today with those from more than 100 years ago.