Short answer: It depends on what you mean by “worth it.”
Freakonomics (one of my podcast favorites) recently did a short show on the merits of learning a foreign language. Most of the foreigners in Spain whom I know would argue that learning a foreign language is indeed quite beneficial. We are always posting articles on the benefits of bilingualism. There are myriad other reasons too: you become smarter, you know your native language better, you stave off Alzheimer’s and dementia, your memory improves, you become more perceptive … In short, the benefits are endless.
But what about financial benefits?
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Freakonomics talks to Albert Saíz, a Spanish (Catalonian) professor of economics who specializes in immigration. He wrote a paper titled Listening to What the World Says: Bilingualism and Earnings in the United States. Saíz wanted to figure out just how much a person can gain (future earnings) by knowing a foreign language. He talked to 9,000 college grads about how their knowledge of a foreign language had affected their wages. Here’s what he had to say: