A variable that induces a change in another variable is a(n):

Which of the following would cause both the equilibrium price and equilibrium quantity of oysters (assume that oysters are a normal good) to decrease?

A) an increase in consumer income B) an oil spill that sharply reduces oyster output C) a decrease in consumer income D) a technological advancement in the production of oysters

Of the following, which country has the highest annual real GDP per capita according to the International Monetary Fund and World Bank?

A. United States B. China C. Italy D. Russia