The Link Between Income Inequality and Physical Pain March 2016 By Eileen ChouBidhan L. ParmarAdam D. Galinsky The Link Between Income Inequality and Physical Pain Harvard Business Review Eileen Chou Chou’s research focuses on the organizational, social, and psychological forces that shape individual and group behavior in organizational settings. Read full bio Bidhan L. Parmar Adam D. Galinsky Related Content Eileen Chou The Goldilocks Contract: The Synergistic Benefits of Combining Structure and Autonomy for Persistence, Creativity, and Cooperation Research Contracts are commonly used to regulate a wide range of interactions and relationships. Yet relying on contracts as a mechanism of control often comes at a cost to motivation. Safety in Numbers: Why the Mere Physical Presence of Others Affects Risk‐taking Behaviors Research As social mammals, being in a group signals a state of relative security. Risk‐taking behavior in other social mammals formed the basis for our prediction that the mere physical presence of others, absent any social interaction, would create a psychological state of security that, in turn, would promote greater risk‐taking behavior.