Assume That the Following Is the Result of a Demand $$Q _ { X } = 1000 - 20 P _ { X } + 4 \text { mame } + 10 P _ { Y } - 15 P _ { Z }$$

Multiple Choice

Assume that the following is the result of a demand estimation:
$$Q _ { X } = 1000 - 20 P _ { X } + 4 \text { mame } + 10 P _ { Y } - 15 P _ { Z }$$ Assuming that all coefficients are statistically significant and the model does not suffer from any estimation issues, which of the following statements is wrong:

A) X is a normal good
B) X and Y are competing products
C) X and Z are competing products
D) A rise in the price of X reduces the quantity of X demanded