Actually the producer can set a minimum revenue under which it's not profitable for him (then he doesn't have to deliver). When the minimum is reached, the Ruch

Actually the producer can set a minimum revenue under which it's not profitable for him (then he doesn't have to deliver). When the minimum is reached, the Ruche says "yes" to the producer -> thus the name :) For french speaking people, this video explain it: https://vimeo.com/17644285 https://vimeo.com/17644285