Right it's not mutually exclusive, but they are suggesting that the donation potential would be higher if they chose to work overtime instead of volunteering. T

Right it's not mutually exclusive, but they are suggesting that the donation potential would be higher if they chose to work overtime instead of volunteering. This could only matter if said lawyer was attempting to maximize the dollars donated - no one does this anyway. And scarcely you'd find someone motivated to work lots of overtime (why have an arbitrary number of 1 hour?) just to give it all away immediately. People have more than one incentive and desire in play. The "utility-maximizing" choice, if both "effectiveness" and "feeling good" matters, would be to donate whatever one cares to and volunteer as much as one cares to.