Sure, though part of my point was that if you loan money to build a house the money flows from your pocket into the pocket of the timber salesman and electricia

Sure, though part of my point was that if you loan money to build a house the money flows from your pocket into the pocket of the timber salesman and electrician. But if the government loans money via bonds and then builds a bridge, that money mostly stays inside the country, where it is both taxable and will contribute to the GDP.