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I take that to mean that you need to have a bachelors in something. Econ is a relatively quantitative field, so that with work experience is likely acceptable.

That really depends on the school. There are many schools where you can get an BA in econ without even taking calculus.

I haven't met anyone in the program with an econ degree. Mostly CS, and engineering. And a few with physics or math degrees.

I'm currently in the program with a BS in Industrial Engineering. I highlighted the CS side of my job in my application, and had done a lot of learning on my own time between my BS and application. So it's definitely possible if you're interested.

You need some undergraduate degree, preferentially CS.

You can get it with a non-CS degree + work experience (see sibling threads).

Some schools accept master's students without an undergrad degree at all but AFAIK most don't. This program doesn't.

Like others have noted, you need some Bachelor's degree minimally. But you don't need to take the GRE.