I'm using tires in this example because it's what I know.
Let's take Discount Tire/America's Tire's founder Bruce Halle. When he started in 1960, he had “six tires, no plan” (literally his book's name)
He borrowed $400 and opened up a shop in an old plumbing shop.
Now, to do this in 2022, I was curious and found the following:
…you would need a minimum of one hundred and eighty – seven thousand, nine hundred and eighty USD ($187,980) to establish a medium – scale but standard tire retail shop business in any city in the United States of America.
This can probably be trimmed, but the point remains:
Starting a business while in poverty is damn near next to impossible for most people.