Use the following to answer question: 
-(Figure: Game-Day Shirts) Use Figure: Game-Day Shirts.Rick is one of 10 vendors who sell game-day T-shirts at football games in a perfectly competitive market.His costs are identical to the costs of the other 9 vendors.If the price of a shirt is $14,the short-run industry supply will be _____ shirts.
Definitions:
Total Revenue Curve
A graphical representation showing how a firm's total revenue changes with variations in the quantity of goods or services sold.
Price-Taking Behavior
The action of accepting the market price as given, typical of participants in a perfectly competitive market who cannot influence prices.
Slope
The measure of the steepness or incline of a line, calculating the ratio of the vertical change to the horizontal change between two points on the line.
Marginal Revenue Curve
A graph that displays how marginal revenue varies as output changes.
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