Diversification reduces risk by combining assets whose returns are not perfectly correlated. This is effective for risks that are specific to an individual issuer, sector, or instrument because negative outcomes in one holding may be offset by better outcomes elsewhere. Credit risk can be diversified by spreading exposure across many issuers, sectors, credit qualities, and maturities, reducing the impact of any single default. Currency risk can be diversified by holding multiple currencies, and it can also be managed through hedging, although it cannot be removed entirely if foreign exposure remains. Liquidity risk can be reduced by holding a mix of liquid assets and by avoiding concentration in instruments that may be hard to sell, although periods of market stress can still reduce liquidity broadly. Market risk, also called systematic risk, is different: it reflects economy-wide and market-wide forces such as recessions, broad interest-rate shifts, and systemic shocks that affect most risky assets at the same time. Because it is common to the whole market, it cannot be eliminated through diversification, only managed through asset allocation, hedging, or reducing overall risk exposure.