Define the riskiness of a gamble as the reciprocal of the absolute risk aversion (ARA) of an individual with constant ARA who is indifferent between taking and not taking that gamble. We characterize this index by axioms, chief among them a “duality” axiom which, roughly speaking, asserts...

We present comparative performance of cryptocurrencies by the performance index based on the Aumann-Serrano –henceforth, AS– economic index of riskiness. We consider three cryptocurrencies: Bitcoin, Ethereum and Binance-coin, which have the largest market capitalizations among all...

We consider the regret matching process with finite memory. For general games in normal form, it is shown that any recurrent class of the dynamics must be such that the action profiles that appear in it constitute a closed set under the “same or better reply” correspondence (CUSOBR set) that...