A worker's labor supply depends on, among other things, his ability, his preference for the task, and the opportunity cost of his time

All the goods and services we produce are ____________ .

a. expensive. b. scarce. c. recyclable. d. efficiently produced.

The kinked demand theory attempts to explain why an oligopolistic firm:

a. has relatively large advertising expenditures. b. fails to invest in research and development (R and D). c. infrequently changes its price. d. engages in excessive brand proliferation.