 However, there are intuitively at least two different reasons that someone might have for being risk-averse. Consider a person who loves coffee but cannot tolerate more than one cup. Consider another person whose tolerance is very high, such that the first several cups are each as pleasurable as the last, but who has a particular attitude towards risk: it would take a very valuable upside in order for her to give up a guaranteed minimum number of cups. Both will prefer 1 cup of coffee to a coin-flip between 0 and 2, but intuitively they value cups of coffee very differently, and have very different reasons for their preference. This example generalizes: we might consider a person who is easily saturated with respect to money (once she has a bit of money, each additional bit matters less and less to her); and another person who is a miser—he likes each dollar just as much as the last—but nonetheless has the same attitude towards gambling as our coffee drinker. Both will disprefer mean-preserving spreads, but intuitively have different attitudes towards money and different reasons for this preference. Call the attitude of the second person in each pair global sensitivity (Allais 1953, Watkins 1977, Yaari 1987, Hansson 1988, Buchak 2013).