a firm's demand curve for labor is the downward-sloping portion of its marginal product curve, option C
It is the graphical representation of the relationship between the price of a certain good or service and the level or amount of demand that consumers experience on it. This process analyzes the effect of prices in the market based on the law of demand, where the slope is negative.
This implies that the curve goes down, because there is an inverse relationship between price and demand: the higher the demand for a product, the lower the price.
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