Consumer & Economic Psychology – Summary Papers
Week 1
Explanations of the endowment effect: an integrative review
The endowment effect is the tendency for people who own a good t ovalue it more than people who
do not.
• Creates market inefficiencies and irregularities in valuation.
• The endowment effect has been attributed to loss aversion causing sellers of a good to value
it more than buyers.
- Loss aversion is a cognitive bias where the emotional impact of a loss is felt more
intensely than the joy of an equivalent gain.
• The maximum amount of money that buyers are willing to pay to acquire the good (WTP) is
lower than the minimum amount of money that sellers of a good are willing to accept to
relinquish it (WTA)
Definition and Scope
• Endowment Effect: People tend to value goods they own more than those they do not own.
This leads to market inefficiencies such as reluctance to trade and disparities in buyer/seller
valuations.
• Demonstrated in two paradigms:
o Exchange Paradigm: Owners are reluctant to trade endowed goods for alternatives.
o Valuation Paradigm: Sellers demand more (Willingness to Accept - WTA) than buyers
are willing to pay (Willingness to Pay - WTP), creating a WTP–WTA gap.
Key Terminology
• Loss Aversion: Losses have a greater psychological impact than equivalent gains.
• Reference Dependence: Value is judged relative to a reference point.
• Psychological Ownership: Emotional attachment or association with a good, enhancing
perceived value.
• Attribute Sampling Bias: Cognitive bias where accessible, frame-consistent attributes
dominate valuation.
• Attachment style: An interpersonal relationship and interaction style; based on childhood
relationship with one’s primary caregiver.
• Coase theorem: Entitlements will be efficiently distributed through bargaining regardless of
their initial allocation if transaction costs are minimal. Initial allocations could influence the
eventual wealth of parties, but the theorem assumes that initial ownership status of an
entitlement should not affect its value.
• Confirmatory hypothesis testing: Searching for and evaluating evidence in a manner more
likely to confirm than disconfirm the hypothesis one is testing.
1
, • Incentive-compatible design: An experimental design in which participants are incentivized to
reveal their true preferences and valuations.
• Indifference curves: The rate at which people are indifferent between quantities of two
goods. For example, how much of Good A is equivalent in utility to an amount of Good B.
• Opportunity costs: The utility that alternative options would provide.
• Possession loss aversion: Greater sensitivity to the loss of a possession than to its acquisition.
• Private self-consciousness: Extent to which one is self-aware and attends to one’s internal
thoughts and feelings. People high in private self-consciousness chronically encode
information as self-relevant.
• Prospect theory: A descriptive theory of decision-making under uncertainty. It assumes
reference-dependence, loss aversion, diminishing marginal utility, and non-linear decision
weights.
• Reference-dependence: Evaluating a stimulus by its value relative to a reference point rather
than by its absolute value.
• Self-affirmation: Deliberate elaboration on one’s past behavior in accordance with a
personally important value, which may buffer or mitigate psychological threats to the self.
• Self-referential memory effect: Actively relating information to oneself (e.g., "Does the word
X describe you?"), makes it better remembered than processing it in other ways, such as with
regard to other people, its semantic meaning (e.g., "... mean Y?"), or phonemic properties
(e.g., "...rhyme with Z?").
• Willingness to pay/willingness to accept (WTP–WTA) gap: The difference in the amount of
money that people are willing to pay to acquire a good and are willing to accept to relinquish
it.
Traditional and Emerging Explanations
1. Loss Aversion (Traditional Explanation):
o Buyers view goods as gains, while sellers view them as losses.
o Linked to brain activity in areas associated with reward and distress.
o Psychological impact of loss frames leads to higher WTA than WTP.
2. Evolutionary Advantage:
o Valuing possessions highly might have evolved as a bargaining advantage.
o Evidence: The effect is observed across cultures and in non-human primates.
3. Strategic Misrepresentation:
o Suggests buyers/sellers may exaggerate valuations due to negotiation motives.
o However, experiments show the effect persists even without negotiation.
4. Reference Prices:
o Buyers and sellers anchor to different reference prices, influencing valuation.
2
, o For example, concert ticket prices differ based on perceived fairness.
5. Biased Information Processing:
o Frames like "buying" or "selling" bias attention and memory.
o Buyers recall negative attributes; sellers recall positive attributes of goods.
6. Psychological Ownership:
o Ownership increases a good's perceived value through emotional or identity-based
associations.
o The Self-Referential Memory Effect (SRE) enhances memory for owned goods,
increasing their value.
7. Attribute Sampling Bias (Proposed Integrative Framework):
o Valuation is influenced by the accessibility of attributes during judgment.
o Frames (buying, owning) bias the sampling of positive/negative attributes.
Experimental Findings
• Cross-Cultural Variability:
o Western cultures exhibit stronger endowment (larger WTP-WTA gap) effects than
collectivist cultures.
• Impact of Ownership:
o Psychological ownership, even imagined or symbolic, enhances value perception.
• Reversal for Negative Goods ("Bads"):
o Owners of bads (e.g., parking tickets) are more likely to trade them, indicating
attribute salience effects.
• Moderators:
o Attachment styles, cultural identity, and self-affirmation influence the effect's
magnitude.
Conclusion
• the endowment effect can no longer solely be attributed to a traditional loss aversion
account. Different elicitation methods and psychological ownership lead people to consider
different information when valuing a good, and not to weight the same information
differently.
Using Information – Judgemental shortcuts
Heuristics: strategies that combine cues and judgemental dimensions. They are thus simple ‘rules of
thumb’.
• Availability heuristic: in assessing the frequency or probability of a stimulus or event,
individuals may resort to a strategy that is based on the ease or difficulty with which bits of
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Week 1
Explanations of the endowment effect: an integrative review
The endowment effect is the tendency for people who own a good t ovalue it more than people who
do not.
• Creates market inefficiencies and irregularities in valuation.
• The endowment effect has been attributed to loss aversion causing sellers of a good to value
it more than buyers.
- Loss aversion is a cognitive bias where the emotional impact of a loss is felt more
intensely than the joy of an equivalent gain.
• The maximum amount of money that buyers are willing to pay to acquire the good (WTP) is
lower than the minimum amount of money that sellers of a good are willing to accept to
relinquish it (WTA)
Definition and Scope
• Endowment Effect: People tend to value goods they own more than those they do not own.
This leads to market inefficiencies such as reluctance to trade and disparities in buyer/seller
valuations.
• Demonstrated in two paradigms:
o Exchange Paradigm: Owners are reluctant to trade endowed goods for alternatives.
o Valuation Paradigm: Sellers demand more (Willingness to Accept - WTA) than buyers
are willing to pay (Willingness to Pay - WTP), creating a WTP–WTA gap.
Key Terminology
• Loss Aversion: Losses have a greater psychological impact than equivalent gains.
• Reference Dependence: Value is judged relative to a reference point.
• Psychological Ownership: Emotional attachment or association with a good, enhancing
perceived value.
• Attribute Sampling Bias: Cognitive bias where accessible, frame-consistent attributes
dominate valuation.
• Attachment style: An interpersonal relationship and interaction style; based on childhood
relationship with one’s primary caregiver.
• Coase theorem: Entitlements will be efficiently distributed through bargaining regardless of
their initial allocation if transaction costs are minimal. Initial allocations could influence the
eventual wealth of parties, but the theorem assumes that initial ownership status of an
entitlement should not affect its value.
• Confirmatory hypothesis testing: Searching for and evaluating evidence in a manner more
likely to confirm than disconfirm the hypothesis one is testing.
1
, • Incentive-compatible design: An experimental design in which participants are incentivized to
reveal their true preferences and valuations.
• Indifference curves: The rate at which people are indifferent between quantities of two
goods. For example, how much of Good A is equivalent in utility to an amount of Good B.
• Opportunity costs: The utility that alternative options would provide.
• Possession loss aversion: Greater sensitivity to the loss of a possession than to its acquisition.
• Private self-consciousness: Extent to which one is self-aware and attends to one’s internal
thoughts and feelings. People high in private self-consciousness chronically encode
information as self-relevant.
• Prospect theory: A descriptive theory of decision-making under uncertainty. It assumes
reference-dependence, loss aversion, diminishing marginal utility, and non-linear decision
weights.
• Reference-dependence: Evaluating a stimulus by its value relative to a reference point rather
than by its absolute value.
• Self-affirmation: Deliberate elaboration on one’s past behavior in accordance with a
personally important value, which may buffer or mitigate psychological threats to the self.
• Self-referential memory effect: Actively relating information to oneself (e.g., "Does the word
X describe you?"), makes it better remembered than processing it in other ways, such as with
regard to other people, its semantic meaning (e.g., "... mean Y?"), or phonemic properties
(e.g., "...rhyme with Z?").
• Willingness to pay/willingness to accept (WTP–WTA) gap: The difference in the amount of
money that people are willing to pay to acquire a good and are willing to accept to relinquish
it.
Traditional and Emerging Explanations
1. Loss Aversion (Traditional Explanation):
o Buyers view goods as gains, while sellers view them as losses.
o Linked to brain activity in areas associated with reward and distress.
o Psychological impact of loss frames leads to higher WTA than WTP.
2. Evolutionary Advantage:
o Valuing possessions highly might have evolved as a bargaining advantage.
o Evidence: The effect is observed across cultures and in non-human primates.
3. Strategic Misrepresentation:
o Suggests buyers/sellers may exaggerate valuations due to negotiation motives.
o However, experiments show the effect persists even without negotiation.
4. Reference Prices:
o Buyers and sellers anchor to different reference prices, influencing valuation.
2
, o For example, concert ticket prices differ based on perceived fairness.
5. Biased Information Processing:
o Frames like "buying" or "selling" bias attention and memory.
o Buyers recall negative attributes; sellers recall positive attributes of goods.
6. Psychological Ownership:
o Ownership increases a good's perceived value through emotional or identity-based
associations.
o The Self-Referential Memory Effect (SRE) enhances memory for owned goods,
increasing their value.
7. Attribute Sampling Bias (Proposed Integrative Framework):
o Valuation is influenced by the accessibility of attributes during judgment.
o Frames (buying, owning) bias the sampling of positive/negative attributes.
Experimental Findings
• Cross-Cultural Variability:
o Western cultures exhibit stronger endowment (larger WTP-WTA gap) effects than
collectivist cultures.
• Impact of Ownership:
o Psychological ownership, even imagined or symbolic, enhances value perception.
• Reversal for Negative Goods ("Bads"):
o Owners of bads (e.g., parking tickets) are more likely to trade them, indicating
attribute salience effects.
• Moderators:
o Attachment styles, cultural identity, and self-affirmation influence the effect's
magnitude.
Conclusion
• the endowment effect can no longer solely be attributed to a traditional loss aversion
account. Different elicitation methods and psychological ownership lead people to consider
different information when valuing a good, and not to weight the same information
differently.
Using Information – Judgemental shortcuts
Heuristics: strategies that combine cues and judgemental dimensions. They are thus simple ‘rules of
thumb’.
• Availability heuristic: in assessing the frequency or probability of a stimulus or event,
individuals may resort to a strategy that is based on the ease or difficulty with which bits of
3
