Since August 1914 the huge credit-fuelled boost in exports had driven up the cost of living. The much-vaunted purchasing power of American wages was melting away.40 It was the American worker who was paying for business war-profiteering. Over the summer Wilson approved moves by the populist wing in Congress to impose a tax on exports to Europe. In the last days of August 1916, in response to the threat of a general strike on the railway network, he intervened on the side of the unions, forcing Congress to concede the eight-hour day.