If one studies for a psychology test, then studies for a biology test, one's memory for the biology material can make it harder to remember the psychology material. this is an example of: a. false memory. b. retroactive interference. c. proactive interference. d. transfer-appropriate processing.

answer; the federal reserve system;

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.