Sarah gets a salary increase. Before her raise, she purchased 5 pounds of fish and 1 pound of beef stew a month. After her raise, she consumes 2 pounds of fish and 3 pounds of beef stew a month. If everything else is held constant, we know that

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When Sarah's income increases, she buys less fish and more beef stew, indicating that she views fish as an inferior good (buying less of it as her income increases) and beef stew as a normal good (buying more of it as her income increases).

Sarah Gets a Salary Increase