I'm not sure if you mean a good GPA to get into an Economics department at a good college or if you are referring to a good GPA that is attained while majoring in economics. Because of the way you worded the question, I am going to assume you meant the latter.
Generally speaking, Economics is considered one of the more difficult (but not the most) majors in higher education; it typically involves the use of various theories and models unintelligible to the average person and requires some degree of algebraic aptitude. The required knowledge of algebra is often overstated at the undergraduate level, but make no mistake: a very strong ability in upper level math (including Calculus) is required to succeed in economic study at the graduate level.
The average GPA listed in Economics is 2.95 (while the average GPA in say, English, is 3.3), implying it is more difficult to attain a higher GPA in the major. In order to be competitive, assuming you wish to go to graduate school, you will need to perform notably above average.
If Economics is what interests you, don't be intimidated! Most people who just put some effort into the coursework will be able to understand it.
Accounting, Business and Engineering
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Engineering(except software and electrical) Accounting Economics Mathematics Physics Chemistry
2.0 for the vast majority of majors. However, a prerequisite for some majors is a GPA of 2.5. Do not rely on GPA alone to be accepted. Take into account your cumulative SAT score, (ACT, etc.)
-- Bus. Admin. -- Poly. Sci. -- Basket Weaving
The minimum GPA for entrance in to SUNY Purchase is 3.0. A slightly lower GPA may be allowed in some majors.
There are several, two of them already listed in your question, engineering, definitely not programming, and more.
Most university majors will require you to write essays regardless, but there are some majors that don't emphasize a lot of writing: Economics Math Engineering Science(except biology and some fields of chemistry)
Economics majors are successful in a wide variety of careers. Although various roles in businesses are most common, economics majors are successful in law, medicine, government, non-profits, and international relations, as well as in academic roles.
Science, especially physics; any engineering discipline; architecture; economics and finance; computer programming; statistics...
You might consider architecture, computer science, or just about any career that has "engineering" as part of its name.
A number of post-secondary options are available to someone with a preference for math. Engineering, finance, economics, and computer science are some options.