Rortybomb's (tongue-in-cheek) proposal to exploit cognitively weak customers' challenges with complex financial services. You've got to read the whole thing to really appreciate it.

Of course, unfortunately this isn't far from what some industries already do.

In addition to the moral point, it also flags a new study warning how "Dementia threatens aging boomers’ portfolios"– the sort of problem that's only going to get worse with time, particularly as the aging in place movement grows.