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Suppose Madison operates a handicraft pop-up retail shop that sells phone cases. Assume a perfectly competitive market structure for phone cases Calculate Madison's marginal revenue and marginal cost for the first seven phone cases they produce, and plot them on the following graph. Use the blue points (circle symbol) to plot marginal revenue and the orange points (square symbol) to plot marginal cost at each quantity.Madison's profit is maximized when they produce a total of phone cases. At this quantity, the marginal cost of the final phone case they produce is , an amount than the price received for each phone case they sell. At this point, the marginal cost of producing one more phone case (the first phone case beyond the profit maximizing quantity) is , an amount phone case they sell. Therefore, Madison's profit-maximizing quantity occurs at the point of intersection between _ than the price received for each than the price received for each the curves. Because Madison is a price taker, the previous condition is equivalent to with a market price equal to

`$20`

per phone case. The following graph shows Madison's total cost curve. Use the blue points (circle symbol) to plot total revenue and the green points (triangle symbol) to plot profit for phone cases for quantities zero through seven (including zero and seven) that Madison produces.