Assume that the demand curve for sunblock is linear and downward sloping. Which of
the following statements about the slope of the demand curve for sunblock and the price
elasticity of demand for sunblock are true?
A) The slope and the price elasticity of demand are constant at all points along the
demand curve for sunblock.
B) The slope is constant, but the price elasticity of demand is not constant at all points
along the demand curve for sunblock.
C) The slope is not constant, but the price elasticity of demand is constant at all points
along the demand curve for sunblock.
D) The slope of the demand curve for sunblock is constant and equal to zero; demand is
perfectly inelastic.
Suppose that some teachers have decided that economic and financial uncertainty have
made the prospect of retiring more risky, and therefore carry a higher cost than not
retiring. By using all available information as they act to achieve their goals, these
teachers are exemplifying the economic idea that
A) people are rational.
B) people respond to economic incentives.
C) optimal decisions are made at the margin.
D) equity is more important than efficiency.