I hadn't thought of religion, but that makes a lot of sense. I could also see homemade gifts being really popular - making something specifically for someone is about more than the thing itself, so it isn't so easily replaceable. I'd also be interested to see what happens when people have so much time and energy to devote to their relationships, with things like that.

Hm.. I'm not really sure how price incentives would work in this context. Avoiding monopolies would definitely be important. If we assume that problem is solved, would competing on price be enough? It's a really weird sort of economics, when most of the customers' income comes from a corporate tithe... I'm too tired for math at the moment, might take a look at it later.