"nobody" invades them, because 'everyone' has a vested interest in a civilized country with an immpecable reputation in banking remaning stable, thus hedging their bets if they lose. Had the Germans wanted to, they could have taken it in 1940 without batting an eye.
This isn't true. Access by vehicle is by bridges, all of which are ready for destruction at a moments notice by the Swiss. After that, any army entering Switzerland would be pinned down under constant gunfire. Could the Nazis at the height of their military power have eventually taken Switzerland? Sure. It would have cost them the loss of several hundred thousand of their best troops, however, something they couldn't afford to lose.
