The empirical demand function for good X is estimated in log-linear form as ln Qˆ = 11.74209 – 1.65 ln P + 0.8 ln M – 2.5 ln PY where Qˆ is the estimated number of units of good X demanded, P is the price of X, M is income, and PY is the price of related good Y. (All parameter estimates are significantly different from 0 at the 5 percent level.)