Use the following to answer question: 
-(Figure: The Market for Economics Textbooks) Use Figure: The Market for Economics Textbooks.At a price ceiling of $40,the market outcome would be a _____ of _____ textbooks.
Definitions:
Interest Rate
The percentage of a sum of money charged for its use over a specified period, typically expressed as an annual percentage rate (APR).
Expected Rate
The predicted average rate of return or growth over a specific period of time.
Total Investment
The sum of expenditures on capital assets, plus the change in inventory levels, within an economy over a period of time.
Market Rate
The prevailing price or interest rate available in the marketplace for goods, services, or financial assets.
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