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You seem to be taking the right approach... to be specific, we need math and intermediate econ grades, and some info on letter writers to estimate. But if you do well from now on and up your GPA to 3.6 by application time, you should be able to get into one of those master's programs.
After that, you will have to work hard in the MA to convince two professors to write you LORs. Make sure you leave your UG institution with at least two letter of recommendation writers who will support you when it comes to PhD applications.