product x has an income elasticity of demand coefficient of -2. it also has a cross-price elasticity of demand coefficient of -2 with product y. which of the following is true? a product x and product y are subsitutes. b an increase in the price for product x will cause an increase in total revenue for product x c an increase in the price of product y will decrease the demand for product x. d product y is an inferior good. e the demand for product x is relatively elastic.
