What is the takeaway from the invisible hand concept

The invisible hand is the concept that economies work best without direct governmental control or planning. Supporters of the invisible hand approach believe that if the economy is left alone, it will regulate itself in most cases. Individual buyers and sellers will act according to what is in their own best interests.

i would say b. research typically uses a variety of sources

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.