The paper suggests a behavioural definition of (subjective) ambiguity in an abstract setting where objects of choice … decision-theoretic foundation for the Knightian distinction between risk and ambiguity and that it provides a unifed framework … for analysing attitudes towards risk and towards ambiguity. …

uncertainty when the firm's preferences exhibit smooth ambiguity aversion. Ambiguity is modeled by a second-order probability … distribution that captures the firm's uncertainty about which of the subjective beliefs govern the exchange rate risk. Ambiguity … ambiguity has no impact on the firm's propensity to export to a foreign country. Ambiguity and ambiguity aversion, however, are …

We examine risk taking when the bank's preferences exhibit smooth ambiguity aversion. Ambiguity is modeled by a second … return risk. Ambiguity preferences are modeled by the (second-order) expectation of a concave transformation of the (first … banking firm finds it less attractive to take risk in the presence than in the absence of ambiguity. This result extends to …

Decisions of investing in sovereign assets involve both risk and ambiguity. Ambiguity arises from unknown elements … characterizing the value of a generic sovereign. In presence of ambiguity, ambiguity-averse investors are prone to pay for obtaining … summary information such as ratings which reduces ambiguity. Ambiguity-neutral and ambiguity-averse investors, then, make …

In this paper, we establish an axiomatically founded generalized recursive smooth ambiguity model that allows for a … separation among intertemporal substitution, risk aversion, and ambiguity aversion. We axiomatize this model using two approaches … characterize risk attitude and ambiguity attitude within these two approaches. We then discuss our model’s application in asset …

relevant measures as reflecting part of perceived ambiguity, meaning subjective uncertainty about probabilities over states …. Under mild conditions, we show that increases or decreases in ambiguity aversion cannot affect the relevant measures. This … property, necessary for the conclusion that these measures reflect only perceived ambiguity, distinguishes the set of relevant …

ambiguity averse relation. First, we define two notions of more ambiguous with respect to such a class. A more ambiguous (I) act … makes an ambiguity averse decision maker (DM) worse off but does not affect the welfare of an ambiguity neutral DM. A more … ambiguous (II) act adversely affects a more ambiguity averse DM more, as measured by the compensation they require to switch …

between the set of relevant measures, shown by KMS [21] to reflect only perceived ambiguity, and the set of measures (which we … perceived ambiguity. Regarding symmetry assumptions, we show that, under relatively mild conditions, a variety of preference … stringent. Only when it is satisfied may the Bewley set be interpreted as reflecting only perceived ambiguity and not also taste …

ambiguity model of decision making under uncertainty developed by Klibanoff, Marinacci and Mukerji (2005).  We revisit these … thought exeperiments and find, to the contrary, that they either point to strengths of the smooth ambiguity model compared to … experiment, raise criticisms that apply equally to a broad range of current ambiguity models. …

Are foundations of models of ambiguity-sensitive preferences too flawed to be usefully applied to economic models?  Al …-Najjar and Weinstein do not apply to quite a few of the ambiguity preference models of more recent vintage, and therefore to that … extent do not undermine the foundational aspects or applicability of ambiguity models in general.  Second, we argue the focus …