If you're in the US, you might have heard of Starker exchanges (a.k.a. 1031 or like-kind). It's a method to defer realization of capital gains, usually on real estate. There are outfits that will help you form a multi-party exchange to match impedances between people who want to buy/sell properties, but some want to trade and some want to exchange for money.

Similar with organ donations. I might not match my wife's blood type, but I can donate a kidney to some other random person if there's a network that matches someone with my wife' blood type to her.

These are all the same idea.