A group for weavers to buy yarn and dye together

In our weaving para each weaver buys yarn alone, so it costs more. And when they borrow from a middleman, he also fixes the selling price. Ten to fifteen weavers can form a group. Each month, note in a register how much yarn everyone needs, then one representative buys in bulk. Costs are shared by calculation and everyone can see the book. Later the group can think about selling together too. You need one trusted bookkeeper, a dry room to store yarn, and a meeting each month.