Endowment bias
Also written Endowment effect
An emotional bias in which people value an asset more simply because they own it — its two attributes are valuing ownership and loss aversion.
In plain language
Ask someone what they would pay for a share and what they would sell the same share for, and the selling price is usually higher. Owning it has made it feel more valuable.
The workbook defines endowment bias as an emotional bias in which people value an asset more when they hold rights to it than when they do not. The investor believes the stock she owns is more valuable than others, and that she will make superior returns once the market recognises it.
It has two attributes:
- Valuing ownership — the asset is worth more because it is mine.
- Loss aversion — selling feels like losing something.
The workbook's everyday observation: inherited stocks are rarely sold, even if they do not fit the overall investment strategy.
How it works
Classification. One of the emotional biases in Chapter 14, section 14.3.1 — with loss aversion, stereotyping, overconfidence and status quo bias. The workbook notes that an emotional bias does not mean making errors; it has an underlying protective purpose — taking a decision that is comfortable for oneself.
How it plays out:
| Behaviour | Why |
|---|---|
| Holding inherited shares that don't fit the plan | Ownership plus sentiment |
| Refusing reasonable offers for an owned asset | Valuing ownership |
| Not selling because selling "locks in" a loss of the asset itself | Loss aversion |
Where the IPS catches it. Chapter 9 (section 9.3.5) asks the investment policy statement to record unique needs and preferences, and gives the example of an investor who owns stock of the company he works in and is reluctant to sell even when it is financially prudent, due to emotional attachment. The workbook does not use the word endowment there, but the behaviour is the same: an owned asset held for reasons other than its prospects.
A worked example
Illustrative figures. Kavita inherited 2,000 shares of a mid-sized textile company from her father. At ₹400 each, they are worth ₹8 lakh — 40% of her ₹20 lakh portfolio.
Her PMS manager points out:
- the company's sales have fallen for three years;
- a 40% position in one stock breaches the 10% single-stock limit in her investment policy statement (an illustrative limit);
- a diversified alternative would cut her concentration risk sharply.
Kavita's answer: "Papa believed in this company. It's worth more than ₹400 — the market just hasn't seen it yet."
Both attributes are visible: ownership ("Papa's shares") and loss aversion (selling feels like losing him again). A workable compromise: sell 1,500 shares (₹6 lakh) and keep 500 shares (₹2 lakh = 10% of ₹20 lakh) as a sentimental holding recorded in the IPS as a unique preference. The attachment is respected; the risk is capped.
Why NISM asks about it
Chapter 14 (Behavioural Finance), section 14.3.1, defines endowment bias, gives its two attributes and the inherited-stock example. Questions test the definition, the classification (emotional) and the two attributes. Chapter 9 (section 9.3.5) is where such preferences are written into the investment policy statement.
Common exam traps
- Two attributes: valuing ownership and loss aversion. A question may offer "anchoring" or "overconfidence" as the second attribute — wrong.
- Emotional bias, not a cognitive error.
- Endowment ≠ status quo. Status quo bias is taking no decision to avoid regret; endowment bias is over-valuing what you own. They often appear together, but the definitions differ.
- Endowment bias ≠ endowment policy. The insurance product of the same name is unrelated.
- The workbook's example is inherited stock that is rarely sold even when it does not fit the strategy.
Where this is taught
- Series XXI-B · Chapter 14: Behavioural Financeintroduced here
- Series X-B · Chapter 16: Basics of Behavioral Financeintroduced here
Related terms
- Behavioural financeThe study of how psychology shapes the decisions of market participants, individually and in groups, and how those decisions show up as gaps and anomalies in financial markets.
- Disposition effectInvestors' tendency to sell winning investments too early and hold losing ones too long — named by Shefrin and Statman (1985) and rooted in loss aversion.
- Overconfidence biasAn emotional bias in which people place unwarranted faith in their own judgement and abilities — leading to underestimated risk, concentrated portfolios and excessive trading.
- Status quo biasAn emotional bias in which a person, fearing regret, ends up taking no decision at all and keeps things as they are — closely linked to regret aversion.
- Investment constraintsLimits on the investments an investor can take exposure to — liquidity needs, time horizon, regulatory and tax constraints, exposure limits, and unique needs and preferences — recorded in the IPS.
- Emotional biasOne of two investing bias categories in behavioural finance — spontaneous decisions driven by deep-rooted feeling, as opposed to cognitive errors, which come from faulty reasoning.