Demonstrate the differences
By the very nature of needing to mathematicize their theories, economists can’t account for some things. You can’t mathematicize culture. A lot of theories covertly smuggle in certain cultural assumptions, like the notion that everybody is like an American. But everybody is not. What looks like an economic model turns out to be a cultural model, and cultures really do differ.
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Literature is particularly important because you identify with people very much unlike yourself, from different cultures, genders, backgrounds. You learn to empathize and get out of the natural narrowness and egoism of thinking everybody is like yourself.
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You get constant practice at it. There’s no way to read Tolstoy without extending empathy on page after page with one character or another. You learn to turn your critical intelligence on your own favorite assumptions. That’s what higher education needs to include.