Sorry, I misread. In the case of a cooperative society, if Bob gives Alice the product of his labor in exchange for anything less than she might turn around and sell it for, the he is either foolish (and Alice is taking advantage of his foolishness), a fetishist, or doing Alice a favor.
Or perhaps he does not wish to expend the time and effort to start a business himself, and wishes to use the resources Alice has made available to make some easy, risk-free money.
Again, your proposed society and the ideology it embodies leaves no room for individual desires different from your own. Anyone who agrees to accept a wage is either a fool, and anyone who offers a wage is an exploiter. The idea that one party is putting themselves at much more risk, and both parties enter into the agreement willingly flies completely above your head. I would like to see you explain
why Bob is being exploited,
why he deserves to be paid "fairly" (at the same rate as Alice, who has more risk). You have provided no such explanation as yet, only that you know better than everyone else, including Alice and Bob.
*actually, I agree he deserves to be paid fairly, but only
Bob can make that designation