Can users post products?

Hi,

According to the documentation I think it would be possible to create a marketplace where users could post products aswel.

I understand that users owning a website on my Network are able to create a full shop. But is it possible at all to just alow users to upload products into the main marketplace on the main website?

I dont want to give everyone a full shop. I need 1 shop where everyone can post products to.

Thanks