What's the meaning of "get stuck with" in this context?
“They needed, at the very least, to incorporate more realism about financial-market imperfections. Traditional Keynesian models, despite their lack of microfoundations, could explain how economies can get stuck with high unemployment and seemed more relevant than ever.”

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First of all, that's a horrible sentence because everything besides "get stuck with" has a "formal" feel to it, and "get stuck with" is very casual.

Let me give you an easier example:  "Chris was eating dinner with Joe. Chris (without Joe knowing) left the restaurant through the back door and Joe got stuck with the bill".

Harder example: "After the divorce, Ann got the house, but also got stuck with the mortgage and her husbands credit card debt".

So, I would say you "get stuck with" something if it's yours, you can't get out of the responsibility, and it's negative. Usually bills/debt/etc.