"Business school is a long-term investment. For two years, you’ll leave your job and forego an income, costing you anywhere from $100K-$200K. On top of that, tuition and fees can run up to $150,000 – and that doesn’t even include living expenses like rent and groceries. Then again, you must balance these short-term costs against the long-term cost of not attending."
Poets and Quants recently published this article comparing business schools as long-term career investments.
The article points out that, according to the Financial Times, Strathclyde Business School is in the top five of schools providing the highest return on investment.