https://www.forbes.com/sites/teresaghilarducci/2020/08/31/mo...
https://www.pewresearch.org/fact-tank/2020/09/25/few-in-u-s-...
https://www.reuters.com/article/us-health-coronavirus-stocks...
Source: https://www.peoplespolicyproject.org/2018/05/01/only-1-in-3-...
> In 2018, the average account balance for Vanguard participants was $92,148; the median balance was $22,217. [emphasize added]
Source: https://pressroom.vanguard.com/nonindexed/Research-How-Ameri...
33% * %42 = ~14%. And while the number is debatable, depending on how we define "significant", only a portion of that 14% has significant wealth invested in the stock market.
I agree with the previous poster. The vast majority of Americans (including employed Americans) aren't invested in the stock market in any meaningful way.