Final answer:
Complementary pairs based on the given price and cross-price elasticities are W and Z, and X and Y.
Step-by-step explanation:
Based on the given price and cross-price elasticities, the pairs of commodities that are complements are:
- W and Z
- X and Y
A complement good has a negative cross-price elasticity, meaning that when the price of one good increases, the quantity consumed of the complement good decreases. In this case, W and Z are complements because when the price of Z increases, the quantity consumed of W decreases. Similarly, X and Y are complements because when the price of Y increases, the quantity consumed of X decreases.