Daniel Defoe based A Journal of the Plague Year on A) the testimony of plague survivors from Asia. B) historical accounts of others, possibly his own family's. C) his medical knowledge of the symptoms of the disease. D) his own experiences during the Great Plague of London.

Which of the following best explains what market forces are? a. the properties of a free-market system that determine what the outcomes will be. b. the decisions of the government that decide what will be produced. c. the ways that producers coerce consumers into buying at the highest price possible. d. the laws that govern whether a producer will be able to buy low and sell high.