 Another problem involving the value of bets arises in establishing the additivity axiom, for even if each in a set of bets is acceptable, it does not follow that they would be jointly acceptable. Consider a person with 4 dollars, who needs 2 dollars for bus fare. He might be willing to take either one of two wagers that cost 2 dollars for a chance at winning enough money to buy a newspaper to read on the ride, but be unwilling to risk all 4 dollars, and the possibility of having to walk home. One response here is to insist that the bets should be presented in terms of utilities rather than money, although this raises difficulties of its own, since these are not objective commodities. Such an approach involves assuming either directly or indirectly that such utilities are additive, but even this is not enough. While it may plausibly be argued that given a set of credences and utilities, pragmatic rationality requires maximizing expected value with respect to those credences and utilities, so that an agent with incoherent degrees of belief is committed to accepting bets (paying off in utility) that lead to a sure loss, the problem for the DBA remains that being so committed to a sure loss is still not necessarily irrational. See (Maher 1993).