Question - Alison consumes only tea and cookies and always consumes 4 cookies with each cup of tea.
a) What is Alison's cross-price elasticity of demand for tea with respect to a change in the price of cookies? Simplify your answer until it is a function of just the prices of tea and cookies.
b) What is Alison's income elasticity of demand for tea? Simplify your answer until you get a numerical value.