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Abstract: This paper develops an experimental methodology that allows the identification of decision-making processes in interactive settings using tracking of non-choice data. This non-intrusive and indirect approach provides essential information for the characterization of beliefs. The analysis reveals significant heterogeneity, which is reduced to two broad types, differentiated by the importance of pecuniary rewards in agents' payoff function. Most subjects maximize monetary rewards by best responding to beliefs shaped by recent history. Others are able to identify profit-maximizing actions but choose to systematically deviate from them. The
interaction among different types is key to understanding aggregate outcomes.
Keywords: non-choice data, typology, tracking, response-time, coordination, public goods, complementarity, altruism, joy of giving, competitiveness, joy of winning, laboratory experiment
JEL Classification: C9, C92, C72, D9, H41