Zero-sum bias: perceived competition despite unlimited resources.

Area of Science:

• Cognitive Psychology
• Behavioral Economics

Background:

• Zero-sum bias is the tendency to perceive situations as zero-sum, where one's gain necessitates another's loss, even when resources are abundant.
• Academic grading systems can be non-zero-sum, with quality-based assessments allowing for unlimited high grades.

Purpose of the Study:

• To investigate the presence and nature of zero-sum bias in a non-zero-sum academic grading context.
• To determine if zero-sum bias is applied symmetrically to desirable and undesirable resource allocations.

Main Methods:

• Three experiments were conducted with university students.
• Participants predicted the grade of the next presenter after viewing grade distributions.
• The study manipulated the number of high and low grades already awarded.

Main Results:

• Participants showed increased predictions of low grades when many high grades had already been awarded, indicating zero-sum bias.
• This bias was not observed in the reverse scenario (predicting high grades after many low grades were given).
• Findings suggest zero-sum heuristics are preferentially applied to the perception of desirable resources.

Conclusions:

• Zero-sum bias can manifest even in non-zero-sum environments, particularly concerning desirable outcomes.
• The bias appears to be a heuristic applied selectively to perceived scarce, positive resources.
• This cognitive bias may stem from an evolutionary adaptation for competing within groups for limited resources.