There's a saying, that:
The poor spend
The middle-class save
The wealthy invest
The unique circumstances of the lockdown and stimulus checks has highlighted these differences in stark ways.
On one hand, you have jumps in sales and valuation of companies like Foot Locker and Nike, as people spend their "free" government money on sneakers. They blow it on useless tat. It's why they will always be poor.
You also see a reduction in debt and increase in savings as people pay off loans and save for the future. Usually these are more middle-class concerns.
Then there is the stock market reaching record highs. The wealthiest 10% of Americans now own 89% of all US stocks, the highest level ever. The rich know that investing is the best way to generate more wealth.
In a years time the poor will have a year-old pair of sneakers and bemoan how unfair the system is. The middle-class will imagine they are a bit further ahead because their bank account will be a bit higher (but they forget about inflation and that it is stripping the modest interest rate they are paid). The rich will have accumulated more of the income-generating assets that will make them even wealthier over the following decades.
The irony is that the poor could have set themselves up to have a new pair of sneakers every year for a decade if they'd thought to invest the money instead of rushing to get rid of it.