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The members of my co-op make and sell items to try to help the under-60s fill their claimed orders, but timing is a problem. If "A" has 3 smoked trout to help with an order, but can never meet up in chat with "B", who claimed the smoked trout order, those 3 smoked trout can not easily change hands. Posting them, even under co-op lock, in "A's" storefront doesn't guarantee that they'll still be there or still be needed when "B" eventually shows up.
BUT, if the entire co-op had access to a Co-Op barn and silo, then co-op members could place items for each other or to help with unclaimed orders directly into the Co-Op barn and silo. Then members could check the Co-op barn and silo for items they needed to fill orders, and remove any that they needed when they needed.
Yes, there would be considerable opportunity for abuse of a Co-Op barn and silo, which is why it would also be necessary to provide co-op leaders with the ability to ban its access by individual members, if necessary. Newly accepted co-op members would need to be additionally granted access to the Co-Op barn and silo by a co-op leader BEFORE being able to remove anything from the Co-Op barn and silo. This would help prevent stealing of co-op resources by transient members just looking for easy pickings. I could see enforcing a 1 month "probation period" for new members of my co-op before granting them access to the Co-Op barn and silo, for instance.
I think a Co-Op barn and silo would end up being self-policing. In co-ops where leadership wasn't making sure the Co-Op barn and silo were being used appropriately, members would likely just stop putting items into the Co-Op barn and silo. But in more co-operative and actively managed co-ops, a Co-Op barn and silo could be an extremely useful tool for sharing produce and products between members.