The "PIGS' crisis is roiling the financial markets -- fiscal problems in Portugal, Ireland, Greece, and Spain. One interesting question to consider is why Portugal, Greece, Ireland, and Spain would be in worse trouble than other European countries. We've already noted Greece's high marginal tax rate. Bloomberg News's Matthew Lynn seems to see it as a monetary issue, as does, to a large degree, Paul Krugman. Let me make another speculative explanatory leap -- or, to use a phrase of Friedrich Hayek's, engage in some "conjectural history" -- and suggest that one reason Portugal, Greece, Ireland and Spain are in rough shape is they have barely any Jews. Some numbers on this are here and here. This is only a half-serious explanation, prompted in part by the idea that observant Jews don't eat PIGS, anyway. There are historically contingent explanations of the paucity of Jews in each country -- most famously, Spain expelled its Jews in 1492, while the Jewish population of Greece was almost entirely wiped out in the Holocaust. I'm not saying it's the only explanation, or that, if these countries had more Jews, they wouldn't still be in trouble. But it's the sort of thing that could stand some further research and analysis, no? Maybe a next book for Jerry Muller? A column for David Brooks or Thomas Sowell or Joel Kotkin? A blog item for Jeffrey Goldberg, who could come up with some catchy two-word phrase for the theory? You'd have to think about whether the lack of Jews is an actual cause of economic trouble or just an indicator of something else -- policies or culture unfriendly to business or capital or outsiders -- that is the actual cause. If the theory has predictive power, then Norway and Finland are the next to go. But the theory may not work in countries with large oil reserves.