Equilibrium: Where Supply Meets Demand $$ End of Chapter Problem

For each of the following situations, determine whether supply, demand, or both shifted and how.

a$.$ Over the last decade, the price of hybrid electric vehicles decreased, while the number of hybrid vehicles sold increased.

In this instance,

must have

b$.$ During winter, the number of daily air routes between Denver and Aspen, Colorado, increases, as does the price of a ticket.

In this instance, the

must have

c$.$ From January through April in the United States, personal certified public accountants $($CPAs$)$ see a dramatic increase in their

number of billable hours, but the average hourly rate of a CPA remains the same.

In this instance,

must have