The Effect of Expected Value on Attraction Effect Preference Reversals.

Area of Science:

• Cognitive Psychology
• Behavioral Economics
• Decision Science

Background:

• The attraction effect demonstrates context dependence in choice, where adding a third option alters preferences between two existing options.
• This effect has been widely interpreted as evidence against value-maximising models that assume independent evaluation of alternatives.
• Previous studies often used alternatives with similar values, minimizing the consequence of the choice.

Purpose of the Study:

• To investigate whether the attraction effect persists when the difference in expected value between alternatives has significant consequences.
• To re-evaluate the implications of the attraction effect for the validity of value-maximising models in decision-making.

Main Methods:

• Systematically varied the difference in expected value between choice alternatives.
• Presented participants with choice sets including an original pair and a third, 'target' alternative.
• Analyzed preference shifts in response to the introduction of the target alternative across different value differentials.

Main Results:

• The attraction effect was observed to diminish as the difference in expected value between alternatives increased.
• Crucially, the attraction effect persisted even when significant consequences were attached to the choice, albeit at reduced levels for large value differences.
• This indicates that context-dependent effects are not solely artifacts of low-stakes decisions.

Conclusions:

• While the attraction effect robustly challenges the assumptions of simple value-maximising models, it does not necessitate that human decision-making is inherently suboptimal.
• The persistence of the effect under consequential choices suggests a more nuanced understanding of decision processes is required.
• Future research should explore the boundary conditions and mechanisms underlying context effects in high-stakes decision-making.