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The United States is one of the best examples of a democratic republic, it is absolutely both a democracy and a republic.
Eugene Volokh of the UCLA School of Law observes that the United States exemplifies the varied nature of a constitutional republic—a country where some decisions (often local) are made by direct democratic processes, while others (often federal) are made by democratically elected representatives
https://en.m.wikipedia.org/wiki/Democratic_republic
The lack of high school civics education in this country has done untold damage
Investors do provide an important role by taking on risk and enabling growth that otherwise wouldn’t occur. The concept of an economy that constantly grows is that, through investment and work, value greater than the sum of the parts put in can be generated.
If Bob pays Frank to build a house and buys all the supplies, Frank does the actual labor, and Laura buys it then Bob and Frank are left with more money than they started with and Laura is left with an asset worth to her what she paid for it. Her net worth is unchanged and she can borrow against the house or sell it some day. All three people have gained from the situation.
If Bob and Frank can’t sell the house though or the price of houses drops while it’s being built Frank still gets his salary, Laura’s life is unchanged or she got a good deal, but Bob just lost everything he put in.
The problem is our society is wildly imbalanced towards Bob, so Frank is going to earn pennies for actually doing the work to build a house and Bob is going to rake in most of the profits. Taking the risk and enabling something to be built is obviously important and a valuable service, but it’s deeply overvalued in our current system as compared to actual labor
That’s how an economy can be doing well (generating lots of value) but for regular humans almost none of the value gets passed to us and instead gets concentrated in the hands of Bobs and Lauras who contribute money instead of labor.
Ensuring us Franks have enough money to spend is critical because, as you pointed out, a far larger share of my money is recirculating into the economy than a billionaire who spends tiny percentages of their net worth. Conversely, someone living paycheck to paycheck is by definition recirculating essentially 100% of their net worth back into the economy every pay cycle.
Lastly being poor is expensive, and has large costs associated. Not having savings to cover unexpected expenses often leads to debt, not being able to afford a large one time purchase often leads to many smaller expenses that add up much higher in total, etc. Enabling people to break out of those cycles is massively beneficial to economies and obviously (and more importantly imo) to individuals and communities