Which type of goods are not excludable but may be finite?

It is often difficult for congressional party leaders to control rank-and-file members of Congress because

A. members of Congress have independent electoral bases in their districts and states. B. members of Congress receive the vast bulk of their campaign funds from nonparty sources. C. members of Congress don't spend much time in Washington. D. Options A and B are true. E. None of the above is true.

Which of the following factors has been suggested to negatively affect the amount of trade between two countries?

a. both being landlocked b. one having previously been a colony c. large fluctuations in exchange rates d. one having previously been a Soviet satellite country