Block R · Behavioral finance
‹ NadirAlpha financial markets handbook: overview
Independent NadirAlpha working reference. Product and feature names mentioned are trademarks of their respective owners. No investment advice.
The most expensive mistakes are made not in the market but in the head; behavioral finance catalogs them; the benefit lies in counter-rules, not in knowledge alone.
201 · Loss aversion & disposition effect
Losses hurt ~2x more than equal gains please; the consequence: selling winners too early, holding losers too long (disposition effect).
Portfolios accumulate "hope positions"; tax logic (realize losses!) is ignored.
Regularly ask each position: "Would I buy this today?"; if not, the purchase price is irrelevant.
The purchase price as the anchor for holding/selling.
205 · Countermeasures: investment guidelines · 162 · Drawdown management & stop-loss logic
202 · Overconfidence & home bias
Systematic self-overestimation (hit rate, knowledge) and overweighting the home market as perceived safety.
Too much trading (costs!), too little global diversification; German portfolios notoriously DAX-heavy.
Log trades and measure the hit rate; world market weights as the reference for the equity allocation.
Confusing familiarity ("I know it") with safety; see concentration risk 156.
203 · Herding
Orienting oneself by the behavior of the crowd, amplified by media and performance rankings; feeds bubbles and panic.
Inflows at the high, outflows at the low; the "behavior gap" between fund and investor return.
Countercyclical automation (rebalancing, savings plans); rationing news consumption in crises.
Reading consensus as safety; when everyone is invested, the next buyer is missing.
204 · Anchoring & framing
First numbers (purchase price, all-time high, price target) act as anchors; the presentation frame (framing) steers decisions ("90% chance of gain" vs. "10% risk of loss").
"I will sell when I am back at zero"; products are sold via framing (the coupon optics of certificates).
Formulate decisions prospectively (target prices from valuation, not from cost basis); check numbers in both frames.
Viewing the all-time high as a "fair value" to which the price "must return".
205 · Countermeasures: investment guidelines, rebalancing, rule-based investing
Institutionalized self-commitment: written investment guidelines (144), automatic rebalancing (143), checklists, a decision journal, the four-eyes principle.
Behavior becomes the largest controllable "return source"; the behavior gap costs 1-2% p.a. depending on the study.
Adopt rules in calm times and do NOT renegotiate them in stress phases.
Relying on discipline in the emergency instead of on processes built in advance.
144 · Risk profiles & investment guidelines · 143 · Rebalancing · 201 · Loss aversion & disposition effect