Here's the general overview of the question: Let's assume that the market for kayak rentals is perfectly competitive. This means that no kayak store has substantial market share and that each store offers the same kayaks. An entrepreneur can open a kayak store without worrying about government regulations (that is, there's free entry), and an existing owner can exit the market easily as well (that is, there's free exit).
The graph below shows the industry supply and demand curves for the perfectly competitive market for kayaks near the ballpark. When fans first found out about Bonds' absence back in March, the beginning of the baseball season, their demand for kayaks decreased. S1 is the initial supply curve.
Price Curves (Supply & Demand): http://courses.aplia.com/problemsetassets/micro/chung_bonds/3_static_graph.gif
Suppose that the graph below shows the marginal cost (MC) and average total cost (ATC) curves for a typical perfectly competitive kayak store.
(Check Graph Below)
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