单项选择题

Long-run aggregate supply is least likely to be affected by changes in the:（）

A. the stock of physic capital.
B. the supply of natural resources.
C. the wage rate of labor.

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单项选择题Which of the following is most likely one of the characteristics of oligopoly（）

A. Collusion.
B. Low barriers to entry.
C. Product differentiation.

单项选择题The most important interest rate used in U. S. monetary policy is the federal funds rate. All else being equal, the federal funds rate will least likely change in a response to a change in the:（）

A. real long-term interest rate.
B. supply of real loanable funds.
C. amount of reserves in the banking system.