It can if you have a job that pays enough for you to be able to invest in the stock/bond markets after cost-of-living expenses. If you're a good investor, you can leverage it up from there to a tidy sum.
Back in the 50's, 60's and 70's it was possible for middle-class wage earners to have enough left over to do small-scale investments in the stock and bond markets, such that nobody could complain about the capitalist system, because the benefits of investment were available to everyone.
But these days, unless you're in the 1%, who's got enough left after expenses to play with the stock market anymore?