The Risk-Return Relationship
In investing, risk and return are inseparably linked: higher potential returns require accepting higher risk of loss. This relationship is not a market flaw — it is why returns exist. If a treasury bond and a startup stock offered the same expected return, no rational investor would accept the startup's additional risk. The startup must offer higher expected returns to compensate for additional risk, otherwise no capital flows to risky ventures. Risk in investing is multidimensional. Market risk (systematic risk) is the risk that the entire market falls — it cannot be diversified away and affects all asset prices during recessions and market panics. Specific risk (idiosyncratic risk) is the risk specific to an individual company or sector — a CEO fraud scandal, a product recall, a regulatory change. Specific risk CAN be diversified away by owning many different uncorrelated assets. Inflation risk is the risk that investment returns fail to keep pace with inflation, eroding purchasing power over time — a 2% savings account in a 5% inflation environment is a real loss of 3% per year. Interest rate risk affects bonds primarily — rising interest rates cause existing bond prices to fall. Liquidity risk is the risk that an asset cannot be sold quickly at fair value — real estate and private equity have high liquidity risk compared to publicly traded stocks and bonds.