A linear utility representation theorem due to Blackwell and Girshick (1953) is used to answer the question as formulated by Grandmont (1987) whether Cobb-Douglas representable preferences are the only ones which are budget-invariant.
A linear utility representation theorem due to Blackwell and Girshick (1953) is used to answer the question as formulated by Grandmont (1987) whether Cobb-Douglas representable preferences are the only ones which are budget-invariant.