I saw a lot of business start ups in my life. And what made it possible, was the very high purchasing power of entry level wages. The starter wages were so high, you could build up your savings while gaining experience at the occupation.
Then after five years or so, start setting up your own business, and then you give the boss a two week notice. Some people I knew did both at the same time. Did their side business part time.
You needed a reserve of funds because sometimes you had to wait 30-60-90 days to get paid. I’ve see at LEAST ten men I used to work with start up in garages and basements. I’ll never forget when I was punching a time card, I the boss gave me a job,
Titanium sheet metal, 30 small complicated boxes, that took me one month, 4 weeks, and the company got 5, that’s right, FIVE years of my salary for one month work. Naturally I was one of the 10 to start up in my garage.
If the owner didn’t have so much suborn pride, to surrender, and raise my pay, I would have stayed. Everybody that quit in those days was always replaced by less experienced help. Employers started getting stingy after 1975 as our anti American gov’t was giving away manufacturing jobs.