Hedge funds are open-end funds of different kinds, that are traded through their management companies or intermediaries, and differ from mutual funds because they are not as heavily regulated, thus being suitable for large investments (in the order of 1 million US dollars or more). Hedge funds traditionally have used models of risk management intended to offset one form of risk by another form of risk reduction through, for example, instruments that do not correlate with each other. However, the popularity of the concept, as well as their acceptance outside of U.S. jurisdictions, has resulted in websites and businesses offering services, products or other resources concerning hedge funds that may not manage risk or may entail increased risk.