Hot dogs and hot dog buns would be expected to have positive

Hot dogs and hot dog buns would be expected to have: positive income elasticities of demand with respect to each other. negative income elasticities of demand with respect to each other. a positive cross-price elasticity of demand. a negative cross-price elasticity of demand.

Solution

a negative cross-price elasticity of demand.

Reason

Hot dogs and the hot dog buns are complements, thus a price increase in one will cause the demand for the other to decline, thus the cross-price elasticity should be negative.