Delay-probability asymmetry in discounting: An anomaly in multiattribute choice

Area of Science:

• Behavioral economics
• Decision science
• Cognitive psychology

Background:

• Delay discounting is crucial for decision-making, with steep discounting linked to behavioral issues.
• Current delay discounting tasks often oversimplify real-world decisions involving both probability and delay.
• A delay-probability asymmetry, where probability is more salient than delay, has been proposed.

Purpose of the Study:

• To investigate decision-making preferences in tasks involving both delayed and probabilistic rewards.
• To compare choices in two-attribute (amount/delay or amount/probability) versus three-attribute (amount/delay/probability) tasks.
• To test prominent choice models' ability to predict observed decision patterns and asymmetry.

Main Methods:

• Two experiments were conducted comparing preferences on two-attribute and three-attribute decision tasks.
• Tasks involved varying amounts of rewards, delays, and probabilities.
• Preference data from three-attribute tasks were used to evaluate existing choice models.

Main Results:

• Prominent choice models accurately predicted preferences in three-attribute tasks but failed to account for the observed asymmetry.
• The study identified a delay-probability asymmetry in decision-making.
• This asymmetry primarily stemmed from a reduction in delay discounting, not an increase in probability discounting.

Conclusions:

• The findings challenge existing models by highlighting their inability to predict delay-probability asymmetry.
• A decrease in delay discounting under combined delay and probability conditions may promote more patient decision-making.
• This suggests a potential adaptive shift towards improved long-term strategy in complex, real-world choices.