
reference(s) -- payoff(s) / challenge(s) / game(s) / math(s) / plan(s) 
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media
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magic / discipline(s) / serious / choice / experiment(s)
- Mark Johnson -- Moral Imagination: Implications of Cognitive Science for Ethics
- Alfie Kohn -- Punished by Rewards: The Trouble with Gold Stars, Incentive Plans, A's, Praise, and Other Bribes
- Mark R. Lepper, David Greene (eds) -- The Hidden Costs of Reward: New Perspectives on the Psychology of Human Motivation
- Barry Schwartz -- The Paradox of Choice: Why More Is Less
- Miguel Sicart -- Beyond Choices: The Design of Ethical Gameplay
token economy / rumor(s) / narrative(s) / etcetera / norm(s)