Many find this faith in technological acceleration to be cheering, but it’s got some problems. Perhaps most importantly, it ignores the reality of diminishing marginal utility. Put simply: useful interventions tend to get less useful as you apply more of them to a problem. Digital technology can do a lot of things, and its declining cost means it will do more and more of them. But it’s important to realize that many of the things it could do but didn’t back when it was more expensive weren’t done because they weren’t worth the expense.