Gritty isn't necessarily a "co-op" value, but I'm not sure that worker co-ops could succeed without it.
https://workersparadise.org/2020/03/28/the-unnamed-co-op-value-gritty/
The Unnamed Co-op Value: Gritty
Calvin Coolidge, the US President that symbolized the 1920s, has…
https://workersparadise.org/2020/03/28/the-unnamed-co-op-value-gritty/