Behavioral Biases

Section: Behavioral Biases in Individual Portfolio Management Estimated study time: 45 minutes Content: Behavioral finance identifies systematic, predictable patterns in how individual investors deviate from rational decision-making. At CFA Level 3, behavioral biases are tested in the context of wealth management — specifically, how advisors identify and mitigate biases in clients (and themselves) to produce better portfolio outcomes. The framework distinguishes between cognitive biases (errors in reasoning or information processing) and emotional biases (driven by feelings rather than deliberate thought). Cognitive biases arise from faulty reasoning processes and are generally more amenable to correction through education and better information. Key cognitive biases include: anchoring (giving disproportionate weight to an initial piece of information — e.g., anchoring to the purchase price of a stock when evaluating whether to sell); framing (reaching different conclusions based on how the same information is presented — a "10% chance of loss" vs. "90% chance of no loss"); availability bias (overweighting easily recalled events — e.g., overestimating the probability of a market crash after experiencing one); representativeness (judging new situations by similarity to a prototype — e.g., buying a good company's stock assuming it will be a good investment); conservatism (underreacting to new information, clinging to prior beliefs); and confirmation bias (seeking information that confirms existing views while ignoring disconfirming evidence). Emotional biases are harder to correct because they stem from feelings rather than cognition. Key emotional biases include: loss aversion (the pain of a loss is felt more strongly than the pleasure of an equal gain — a 2:1 ratio empirically; this leads investors to hold losers too long and sell winners too soon); overconfidence (excessive faith in one's own ability to predict returns…