It most certainly is a multiparty negotiation. You eat things that can be reasonably obtained from vendors in your area, who in turn stock things they think the

It most certainly is a multiparty negotiation. You eat things that can be reasonably obtained from vendors in your area, who in turn stock things they think they can sell. You order from the items available at the establishments you visit with your friends and family, who have input into where you go. You recommend foods to others, and eat foods that others recommend to you. In short, eating is a cultural activity you participate in. As far as veganism is concerned, it is notable that it is much easier to be vegan now than 20 or even 10 years ago, as vegan ingredients are more widespread and higher quality, and "vegan options" are essentially standard in restaurants. This didn't happen through legislation, but by the application of social pressure by vegans - if vegans can't eat at your restaurant, they won't just go somewhere else, they'll take their friends with them. It is the output of a massive multiparty negotiation.