When restaurant prices rise faster than prices of food at grocery stores,real income rises for people who visit restaurants relative to those who cook for themselves.
The real income of those who visit restaurants actually falls because the relative price of meals has increased.

Question

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If restaurant prices rise faster than grocery store prices, the relative price of meals at restaurants increases. This means that it becomes relatively more expensive to eat at restaurants compared to cooking at home. As a result, the real income of those who visit restaurants actually falls, as they have to spend more of their income to maintain their previous level of consumption at restaurants.

When Restaurant Prices Rise Faster Than Prices of Food at Grocery