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The risk of a decision d is the expected value of the loss incurred using d taken over all possible states of nature. A risk averse person is one who prefers to behave conservatively. A decision maker (DM) is said to be risk averse if the DM prefers the expected consequence of a nondegenerate lottery to that lottery (a nondegenerate lottery is one where no single consequence has a probability of one of occurring). A DM is risk averse if and only if the DM's utility function is concave. In contrast, a risk prone person is one who does not prefer to behave conservatively. A DM is said to be risk prone if the DM prefers any nondegenerate lottery to the expected consequences of that lottery. A DM is risk prone if and only if the DM's utility function is convex. Finally, a DM is risk neutral, if and only if the DM's utility function is linear. Lottery; Risk assessment ; Utility theory.