So we have to keep some fraction aside as reserves and that way we can use that money to lend more, but in the process, we create a multiplier effect and create money.
Adding in the companies supporting the yards, and the shops and services that support these workers, the total ran to 400,000, an employment multiplier of 4.
In it, Keynes gave a much more complete account of how the multiplier might work, and how it might enable a government to drag a slumping economy back to health.