As firms add a few workers, output increases exponentially; however, soon each additional worker adds less and less output. During this time, marginal cost goes from to Select an answer and submit....

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Extracted text: As firms add a few workers, output increases exponentially; however, soon each additional worker adds less and less output. During this time, marginal cost goes from to Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a negative; positive. decreasing; increasing. positive; negative d increasing; decreasing