Lizzie's preferences are shown in the figure above. Which of the following combinations of goods does Lizzie prefer the most?

A country's production possibilites increase because the available workers become more skilled at using a computer. This is an example of growth caused by:

a) global resources b) physical capital c) technology d) production opportunity

Barter is the:

a. direct exchange of goods and services. b. exchange of goods, but not services. c. system that does not depend on a coincidence of wants. d. system used in advanced economies.