It’s important to understand why some funds target operating in the green zone, and why other funds may intentionally operate in the yellow or red zones. The green zone calculus is simple: when a fund maintains fixed expenses that are lower than its fixed revenues, it operates with a margin of safety. In a green zone fund, both the fund and its investors have a reasonable cushion to ride out difficult periods of low or no performance, and the fund operates with less business risk. In other cases