You guys are arguing that retirees can all retire fairly wealthy, able to spend far, far more than the SS payments they get today. Well, that requires the economy to increase production, if those retirees are planning on spending their money.
You are enamored with the big numbers being thrown around when you apply one's SS contributions to the stock market, based on past performance, but you gloss over the real-world problems with those projections when applied to all workers and retirees.
It's funny - for years, because of MMT, I've gotten the "why don't we just give everybody a million dollars, then?" argument, which we all seem to understand would result in inflation, because the economy wouldn't be able to meet the increased demand. But now, when privatization proponents claim that investors would have had $1.4 million each by the time they retired, suddenly the whole millionaire thing is plausible to them. At least the government has the ability to create that much money; with privatization (as I explained before), you only have as many dollars available as people contribute.