Those who are interested in assessing the relative standard of living of different countries over a given time period are most likely to look at

Agnes can produce either 1 unit of X or 1 unit of Y in an hour, while Brenda can produce either 2 units of X or 4 units of Y in an hour. The opportunity cost of producing a unit of Y is

A) 1 unit of X per unit of Y for Agnes and 2 units of X per unit of Y for Brenda. B) 1 unit of X per unit of Y for Agnes and 1/2 unit of X per unit of Y for Brenda. C) 1 hour for Agnes and 1/2 hour for Brenda. D) 1 hour for Agnes and 2 hours for Brenda.

When economists say that money promotes ________, they mean that money encourages specialization and the division of labor

A) bargaining B) contracting C) efficiency D) greed