In which of the following ways does using purchasing power parity to calculate GDP differ from the use of straight GDP in measuring a country's economic development?
a. It typically lowers the overall value of the economy for less-developed countries.
b. It typically elevates measured income for countries with advanced welfare systems.
c. It typically elevates measured income for less-developed countries.
d. It typically lowers the per capita income in a country no matter its level of development.
e. It increases the gap in economy size between developed and less-developed countries.