Earlier quoted context omitted.
I think in both cases, it's just the market. There is a demand for engineers which is more than for janitors, and with more limited supply. Everything else is just moving money from one pocket into another, it doesn't have economic significance.
"It's just the market" is such a lazy reply. Did entrepreneurs not like making money back then? Or did they realize that a healthy society was just as important as healthy companies?
Another change since then was the rise of the corporate raider. Used to be that you could run a public company without profit as the primary motive. Parable of the Mexican fisherman, and such. (https://bemorewithless.com/the-story-of-the-mexican-fisherma...) But now people like Carl Icahn (and Mitt Romney in his private sector days) actually hunt for companies that are not maximizing return to investors, and remake them into companies that do. Apple actually had to fend off Carl Icahn recently. (http://www.marketwatch.com/story/carl-icahns-2-billion-apple...)