Please select the word from the list that best fits the definition Theory that holds that people are motivated by self-interests in their interactions with other people.
-social structure
-exchange theory
- master status
-social interaction
-role strain
-formal organization
-bureaucracy

they protect against unsafe foods and medicines being sold

explanation:

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.

money is the anwser i think