I doubt that we have a huge paper notes mass being hoarded in the US, most of it should be circulating pretty constantly. I see it important for exports as the US gets to produce paper that we send over to other countries in exchange for goods. They store it and we never pay back as long as our economy, technological progress, science, higher education, cutting-edge healthcare, entertainment, army stay ahead of others then we never ever going to pay back. And Nixon shock where the US dollar stopped being pegged to gold showed that power to others since no one in the world would stop using the US dollar just because it's value now is measured how the US can dictate (https://en.wikipedia.org/wiki/Nixon_shock).

Most Americans shouldn't keep their money in savings and should invest into the stock market because it's a reflection of our collective economical input. And if you just keep it in Savings then it'll keep up with the interest rate which doesn't change the stored value, so what's the point? While in big indices there always going to be winners because that's just the nature of the game, so by betting on winners you are going to outrun the interest rate by capturing this additional value that is being created. And people working for these winning companies and startups are very interested in beating the interest rate, they're mostly shareholder aligned as they themselves are equity holders. If you don't have equity you're working in, it still makes sense to bet on winning companies since those people are vey much equity aligned and just want to capture the market share.

Pension funds, 401k are all tight to various investments, indices, etc. that are all reflection of the total economy. And I see it as my participation in the broader economy as I spend money that creates jobs and creates new economic exchanges further, and as a shareholder I capture that value back anyway. People should keep their spending at their social level if they want to keep the economy going smoothly.

I totally agree, but the person to whom I was replying probably does not.