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Felipe Almeida &#38; Marcelo Curado (2019)EconomiA, Available, 20(1), pp. 15-26Abstract. The search for psychological content or support for economic decision-making is a subject that is contemporaneously stressed. Considering Keynesian and Post-Keynesian economics, it is possible to perceive several approaches that reclaim behavioral economics as a psychological support for decision-making. This study follows a different procedure. It points out the psychological issues studied by Keynes and introduces psychological theories that analyze these issues in order to emphasize psychological support for Keynes’s approach to decision-making. In doing so, this study relies on the role of observation, cognition, and imagination in the Keynesian perspective on decision-making.Keywords: Keynesian decision-making; Cognition; Observation; Imagination; Vicarious learning"Taking into account Keynes’s definition of convention, Dequech (2011) stresses that Keynes does not clearly define the concept of convention with which he worked. Consequently, there are several interpretations of this concept. […] According to Dequech (2012), a convention is a socially shared pattern of behavior and/or thought that is followed, or expected to be followed, by decision-makers, at least partly. External pressure is not mandatory. It does not exist for several conventions, and may be only partially present for others. The Keynesian convention is not only a behavioral rule; it is also a way of behaving (Dequech, 2003). Instead of offering another Keynesian concept of convention, Latsis et al. (2010) address general features of the Keynesian convention […] From a conventional judgment perspective, the key subject is interpretation of what others think. According to Keynes, this interpretation takes to form of anticipation. […] Imagination is associated with Keynes’s concept of convention because it demands that decision-makers have capacity to imagine themselves in place of the observed in order to achieve similar results. Cognition signifies the capacity to understand what conventions mean and how they can be taken into consideration by decision-makers." Felipe Almeida &#38; Marcelo Curado (2019) Link to the review (open access)