Since MRP is the product of MR and MP if either of these changes the factor demand curve will shift. Suppose DF1 is the demand (MRP) curve for workers at a soft drink bottling facility when demand for the soft drink increases (say because a competing brand increases price).

    The demand for workers would shift from DF1 to DF2 because the Marginal Revenue for soft drink sales rose. Any increase in demand for the firm's soft drinks would shift out labor demand. This is why we call factor demands derived demands, they are derived from the demand for the goods and/or services sold by the firm.

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