If the free juice they give you in the supermarket tastes bad, will you buy it? We assume the free version to have similar quality to the paid one. It's in the

If the free juice they give you in the supermarket tastes bad, will you buy it? We assume the free version to have similar quality to the paid one. It's in the vendor interest, so that we like it and become a paid customer. If they can't convince us of their quality in the free version, how are we supposed to trust the paid one?