"No single Swede comes close to the epic wealth of a Bill Gates or a Warren Buffett." -- wasn't Ingvar Kamprad (of IKEA fame) more wealthy than Gates at one point? Due to some currency being strong, iirc.
I believe that the wealth that Ingvar Kamprad ultimately controls is substantially larger than what a look at Forbes 500 might indicate, but perhaps that is not uncommon.
So I was wrong in naming Switzerland - should've mentioned the Netherlands, Luxembourg, the Netherlands Antilles and Curaçao instead.