Can I get an MBA in marketing if I major in economics? Or will it hurt me looking for a good marketing job?

Sure you can. You can actually get any undergraduate course and take an MBA after. Economics actually is a good undergraduate course to get before you get your MBA. Economics play a vital rule in Marketing. Economics play a major rule to determine product life cycles, buying patterns of your target consumers and consumer research. When you finish your economics course it will be easy for you to enter in the market research department or even be a market research analyst and you can actually get your MBA while working. Pursue economics as a course and you will easily get a job in marketing and your MBA course will be a walk in the park good luck