The above figures show the market for hamburger meat. Which figure(s) shows the effect of a nation-wide strike by butchers and meat-packers?

If the interest rate rises, then firms' investment spending:

A. falls. B. also rises. C. remains unchanged D. reacts unpredictably.

The set of income-quantity pairs showing the amount of a good the consumer buys at various levels of income is called

a. a compensated demand curve. b. a budget line. c. an income-elasticity curve. d. an Engel curve.