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You say you want to study economics (presumably even if you went to Michigan and had Ross as an option), but you'd only consider studying economics if it was in Kelley?
This doesn't make any sense. If you want to major in "pure" economics and do research, you wouldn't want to do it in a business school. If you wanted to study the business "version" of economics, you'd want to major in finance, which Kelley has.
Presumably you have the capability of typing
Kelley School of Business: Indiana University Bloomington into the bar in your browser where you the URLs go. Then you'd go to Kelley's website, and you'd see what majors they'd have, and you'd see they have finance and not economics. Northwestern, who incidentally has one of the best undergraduate economics programs in the country, has a minor in business and a program for financial economics and managerial analysis, but they only have economics as an undergraduate program. Wisconsin has finance in their business school, not economics.
You either want to study economics as an academic discipline, which will generally have some courses and some focus on the business world, or you want to study economics as applied directly to business, which is either finance or economics as applied to some kind of operations management (like applying it to agriculture).