Romney's I.R.A. also appears to have invested in so-called blocker corporations in the Cayman Islands and elsewhere. U.S. pension funds, foundations, and even I.R.A.'s routinely use offshore blocker corporations to avoid something called the Unrelated Business Income Tax, which was designed to keep nonprofits from competing with ordinary companies in areas outside their core purpose: if you invest directly you get hit with the tax, but if you invest in a blocker, which then invests in the U.S. business, you escape it. Romney's I.R.A. appears to have employed this lawful escape route, and his campaign has used language suggesting that it has. But that would mean the Romney camp's claim that Mitt's tax consequences of investing via the Cayman Islands is 'the very same' as it would have been had he invested directly at home is simply not true."