@ppng A curious addendum: the same amount of extra production would be created if instead of investing the money I just stuffed it in my mattress. https://www.lesswrong.com/posts/ANYrRYWZ4K3DnhWDe/are-long-term-investments-a-good-way-to-help-the-future?commentId=NGtyBJKcreBFYQeDo
The importance of investment is that it allows capitalists to capture the value they create & thus incentivises capital formation.