““Another activity that isn’t celebrated as charity is what Robin has called “marginal charity.”65 Here the idea is to nudge our personal decisions just slightly (marginally) in the direction that’s beneficial to others. Normally we try to optimize for our own private gain. When a property development firm is planning to build a new apartment complex, for example, they’ll crunch a few numbers to determine the most profitable height for the building—10 stories, say. But what’s optimal for the developer isn’t necessarily optimal for the neighborhood. Regulations, for example, might make it difficult to get building permits, which can result in housing shortages. So if the developer built 11 stories instead of 10, it would reduce their profit by only a tiny amount, but it would add a bunch of new apartments to the neighborhood.””
