We show, to the right, that if the market price were $2 the firm, whose supply curve is shown, would be willing to supply one unit. If the price were $4 it would supply 2, and so on. We can think of $2 as its marginal sale price on the first unit, $4 as its marginal sale price on the 2nd, and so on. At a price of $14 it will supply 8 units. Even though it's willing to sell units 1-7 for below $14, the way markets usually work it ends up selling all 8 units at $14 each, giving it a revenue of $14 x 8 = $112.
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