It's way more complicated than that. Say hypothetically, we have an abundance of milk which we don't but assume we do, so everyone can have as much milk as they wanted, and nobody needs to pay for it. First of all, the entire supply chain of milk production, packaging, & distribution must still exist & function efficiently, & maintain quality standards, much like it does in the current developed world. People will still need to work, farmers must still milk the cows, factories must still produce and package, goods must still be transported to and shelved on retail outlets for customers to access it. Someone still needs to clean the retail floor, and someone still needs to engage with the customers, and you need a way to reasonably compensate everyone involved. Second of all, what about milk derivatives that are not abundant, like cheese or butter or your favorite Greek yogurt? They are not in abundance, so you're back to a scarcity economy and you need to figure out how to reasonably distribute them based on need.