We investigate the empirical relation between ambiguity aversion, risk aversion and portfolio choices. We match administrative panel data on portfolio choices with survey data on preferences over ambiguity and risk. We report three main findings. First, conditional on participation, ambiguity...

This paper belongs to the study of decision making under risk. We will be interested in modeling the behavior of decision makers (hereafter referred to as DM) when they are facing risky choices. We first introduce both the general framework of decision making problem under risk and the different...

This paper focuses on the study of decision making under risk. We first recall some model-free definitions of risl aversion and increase in risk. We propose a new form of behavior under risk that we call anti-monotone risk aversion (hererafter referred to as ARA) related to the concept of...