OK, but if someone who made a fortune in Germany moves to Switzerland and buys a Mercedes, does that not add about $50 K to Swiss GDP? The reasons I suspect it might are (1) GDP is essentially a measure of economic activity, i.e., transactions, and (2) how all of the small tax shelters, Monaco, Lichtenstein, etc, have very high per-capita GDP.

Regarding (1), it is possible that living in a tax shelter gives residents without a fortune more opportunities to make money than living in a country like Germany or the US does, but I lean towards the possibility that per-capita GDP is simply inaccurate or flawed as measure of the economic prospects of the residents who don't have fortunes.

Also, Singapore's per-capita GDP is very high compared to the personal income of its human residents (I have read) and I figure that was because a large fraction of Singapore's businesses are owned by non-Singaporeans (which has been the case, BTW, since Singapore's founding by British trading interests).