Thanks to @luisrazeto I am reading a little book by Albert O. Hirschman, "Getting Ahead Collectively"
"As an economist I had expected that the need to mobilize a minimal account of capital would be at the root of at least some of the cooperative, worker-managed enterprises. But it turned out that a more fundamental need is, once again, some experience dispelling isolation and mutual distrust."
People carry this positive legacy of solidarity with them from experience to experience.