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# The demand equation for a firm's product is given by the equation ln Q = 100 0.25 ln P 0.5 ln M + 0.

The demand equation for a firm’s product is given by the equation ln Q = 100 − 0.25 ln P − 0.5 ln M + 0.5 ln A + 10 ln PY, where Q = quantity, P = price, M = income, A = advertising expenditures, and PY = price of a related good. Based on this demand equation, this good is: Answer a.