If one person's consumption of a good does not preclude another's consumption, the good is said to be:

Borrowing in one's own currency has many advantages for low-income nations (such as Chile). Which of the following is NOT an advantage?

A) Service payments are usually retained in the nation. B) Defaults are typically not an issue. C) The nation is never obliged to repay—it can roll over the debt in perpetuity. D) More national debt actually helps credit markets deepen and mature.

Refer to the figure above. At what level of output does the firm maximize profits?

A) 0 units B) 10 units C) 20 units D) 30 units