If demand is estimated using the empirical specification Q = 1n a + b1nP + c1nM + d1nPR , then an equivalent expression for demand is
A. Q = abPcMdPR.
B. Q = a + bP +cM + dPR.
C. lnQ = a + bP + cM + dPR.
D. Q = ea + bP + cM +dPR.
E. none of the above
Answer: E
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