In a free market, supply and demand determines?

Which fact would this be, and how might you verify the truth?

Which of the following is not a requirement to become a us representative (congressman/congresswoman)? a. be at least 25 years old b. have been a citizen of the united states for the past seven years c. be (at the time of the election) an inhabitant of the state they represent. d. hold a college degree

Ahistorian claims massive drought and famine in china caused the boxer rebellion. which of the following historians is making a counterclaim?