Comment I'm surprisingly supportive of this (Score 1) 70
1) 401ks indirectly contributed, and i would argue was the single largest contributor, to the growth of private equity and asset classes like venture capital, which led to an explosion of startups and innovation. It works like this. VCs generally get the money they invest in startups from either wealthy families (family offices) or very large money managers like pension funds, insurance companies, sovereign wealth, and the like. Pension funds, from a dollar perspective, are around 85% of all funds going into Venture capital, so in essence workers working every day and contributing to pension funds for their later pensions are a key contributer. However 401ks did as well, because pension funds generally are required to allocate assets according to some strategy. It's usually something like 30% bonds (US treasuries), 30% blue chip stocks (DOW, S&P 500, NASDAQ Index funds), and then some other areas like foreign stocks, foreign bonds, etc. Virtually every one has at the bottom 1-2% in "high-risk, high return asset classes"; this is usually VCs. What happens is 401k contributions also buy into usually index funds, like the S&P 500, and that also happens every pay period. That raises the value of those funds (and the stocks, it's great to be on the S&P 500). As such, at the end fo the year, maybe the allocation is now 30% bonds, 33% stock, other stuff, and now
2) 401ks end up being a bit of a burden when you're retired. While some people use them for sure as an income source, because your gains are taxed as income, if you have other sources of income you want to draw on this as little as possible. As such, Rollover IRA money, from the 401k, just sits there in an asset class, not being used. Many of the clients I helped saw their 401k RMD as a burden; they never needed it but were required to do it.
And let's add one more element here. Private equity, and in particular venture capital, has much longer market cycles from the public markets, so over a 5 year horizon might not beat the public markets, but over 20 years the returns will crush the markets. For example the last 5 years VC has struggled to compete with public stocks, but over a 20 year horizon the category has achieved 14.3% CAGR compared to say the S&P 500's 7.5%. This means over a 20 year horizon, $1,000 would become $15,533 when in VC vs. $4,247 in S&P 500; roughly 3X the gain.
I say all that because 401k money is long-term horizon. Gen Z appears to be good savers and is contributing well, but they're not touching the money for 30 to 40 years. That makes the capital patient, and with a long-term horizon looks very attractive. And given the size of 401k contributions, this would create a whole new pool of funds available to invest in the next generation of startups and keep the innovation cycle moving.
I'm not a fan of crypto, but i have to admit my issues with it have led me to miss out on the upside. But opening up the US 401k market, even just a small fraction such as 3 or 5%, would create an influx of capital available for VCs and as such for startups, creating a whole new generation of companies. And 401k money is great for this because it's long-term horizon and patient.