________ is the ability to produce more of a good or service than competitors when using the same amount of resources

For Brent, if the marginal utility of sleeping an extra hour, from 8 a.m. to 9 a.m., is negative: a. Brent is better off getting up at 8 a.m. or earlier

b. Brent is better off getting up at 9 a.m. c. Brent's total utility from sleeping must be negative. d. Brent's average utility from every hour he sleeps must be negative.

The price elasticity of demand is

A) always positive, so there is no reason to consider the absolute value of the price elasticity of demand. B) always negative, but by convention, economists typically express the price elasticity of demand as an absolute value. C) always equal to -1, which by convention economists typically express as an absolute value, or 1. D) always equal to zero, so there is no reason to consider the absolute value of the price elasticity of demand.