PRIs are mission-driven investments closely related to charitable grants. Unlike MRIs, an investment is required to meet a specific charitable standard to qualify as a PRI. However, a PRI does not need to be a market-rate or "prudent" investment. PRI strategies are still an innovative funding tool used by a small number of foundations. Traditional grantmaking strategies only use grants and avoid PRIs due to the risk-averse nature of foundations, which are hyper-focused on charitability. PRIs create an extra layer of regulatory and underwriting complexity for foundations. Thus, it is easier for a foundation to make a grant to a nonprofit than a fund manager.