> Economies don't grow from some abstract demand existing, they grow from production (of final goods and services). Investment in productive assets is the key t

> Economies don't grow from some abstract demand existing, they grow from production (of final goods and services). Investment in productive assets is the key to the economy's growth. Production of something not in demand is a nonsensical way to try to grow an economy. Investment serves an economy by allowing production to happen to meet demand. It's not something we need to encourage particularly hard because it has a built-in profit motive. A billionaire spending all their money is an incentive for other people to invest in the production of those things being built, which is important because it creates income for the workers, which creates demand. Investing for the sake of investing in production otherwise is limited since if people aren't buying, less money is circulating, and less actual useful stuff (such as improvement in living standards) can happen as a result. But I suppose that pointless production (a lot of recent VC activity looks somewhat like this) is still better than a billionaire parking money in hedge funds or HFT shops that are just buying/selling stocks that represent past investment, instead of that money going to the productive enterprise itself.