Suppose Mark Sanchez, quarterback of the New York Jets, increased his annual income 20 percent by endorsing Kellogg's Com Flakes. If his demand for hair shampoo didn't change, what can we say about his income elasticity of demand for the shampoo? Suppose he decides to upgrade his housing, moving from his 51 million home to a $1.5 million home. What can we say about his income elasticity of demand for housing?