MOST governments say they want to encourage entrepreneurs. Yet when foreigners with ideas come knocking, they slam doors in their faces. America, surprisingly, is one of the worst offenders. It has no specific visa for foreigners who wish to create new companies. It does offer a visa for investors, but the requirements are so stiff—usually an initial investment of $1m, or half that if the firm is in a depressed neighbourhood—that the annual quota of 10,000 visas is seldom filled.