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Jackpot Structural Features: Rollover Effect and Goal-Gradient Effect in EGM Gambling.

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|June 12, 2015
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High-value electronic gaming machine (EGM) jackpots, especially deterministic ones, significantly increase player bets. Small jackpots do not produce the same intensified gambling behavior, regardless of jackpot type.

Keywords:
DeterministicElectronic gaming machine (EGM)Gambling intensityJackpotJackpot sizeProgressive

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Area of Science:

  • Behavioral Psychology
  • Gambling Research
  • Human-Computer Interaction

Background:

  • Limited research exists on how jackpot features influence electronic gaming machine (EGM) gambling behavior.
  • Common jackpot features include progressive (incrementally growing) and deterministic (guaranteed after fixed, random bets) types.
  • Understanding these influences is crucial for responsible gambling initiatives and EGM design.

Purpose of the Study:

  • To investigate the joint influences of progressive and deterministic jackpot features on player betting behavior.
  • To examine the moderating role of jackpot size (small vs. large) on these influences.
  • To test hypothesized psychological effects, such as the 'goal-gradient' and 'rollover' effects, in EGM gambling.

Main Methods:

  • A crossed-design experiment was employed using a computer-simulated EGM with real money gambling.
  • Participants gambled for real jackpot prizes of either $500 (small) or $25,000 (large).
  • Betting behavior was analyzed across different jackpot configurations (progressive, deterministic, and their combinations).

Main Results:

  • Players placed significantly higher bets (20.3% above average) on large, deterministic, non-progressive jackpots, supporting the 'goal-gradient effect'.
  • Large, non-deterministic, progressive jackpots also led to increased bets (17.8% above average), similar to the lottery 'rollover effect'.
  • Neither the 'goal-gradient' nor 'rollover' effect was observed with small jackpot sizes, indicating jackpot value is a key factor.

Conclusions:

  • High-value jackpot configurations, particularly deterministic ones, can intensify player betting behavior on EGMs.
  • The psychological effects driving increased betting are dependent on the jackpot's potential size.
  • Findings suggest that specific jackpot designs may encourage riskier gambling behavior, necessitating further investigation into responsible design.