In Germany, there are "Genossenschaften"[1], which are cooperatives organized by small members to further a common commercial interest. For example, winemakers, which are often family businesses (at least in the area I'm from), often form them to sell wine, to have better leverage against the buyers, which are usually big companies like Aldi.

[1]: https://en.wikipedia.org/wiki/Eingetragene_Genossenschaft