Regardless of her income and regardless of prices, Amy always spends 45% of her income on clothing and food, 15% on transportation, and 40% on entertainment. This behavior is consistent with the following:
A、All goods are perfect substitutes.;
B、Amy's demands for commodities do not change when their prices change.;
C、Amy consumes all goods in fixed proportions.;
D、Amy has a Cobb-Douglas utility function.
发布时间：2025-07-13 06:49:29
