I don't think it really applies to a packet switched network: > adding extra capacity to a network when the moving entities selfishly choose their route can in

I don't think it really applies to a packet switched network: > adding extra capacity to a network when the moving entities selfishly choose their route can in some cases reduce overall performance. Network frames don't "selfishly choose their route" and are entirely at the whims of the Routers they pass through. Because of complex routing and suboptimal peering/routing, a "shortcut" could be added that makes it quicker to get from A to X1 but makes it take much longer to get from A to X2 Additional routes (as in "directing packets the right way", not physical routes) would fix this and get the best of both worlds.