>but the prices would also be commensurately higher.
No, the prices would be more transparent, not higher. You've made clear in other comments ITT that you believe tipping to be mandatory ("If you don't want to tip, don't dine at full-service restaurants in America"), which means you consider prices 15% or more higher then sticker price to already be the rule. Requiring that to be part of the advertised price instead of hidden is purely good for free market efficiency. Anything that isn't fully optional should be part of the advertised price. The employers and employees have superior information for correct decisions, and once a transaction (dining) has already been committed to a superior position of power as well.
No, the prices would be more transparent, not higher. You've made clear in other comments ITT that you believe tipping to be mandatory ("If you don't want to tip, don't dine at full-service restaurants in America"), which means you consider prices 15% or more higher then sticker price to already be the rule. Requiring that to be part of the advertised price instead of hidden is purely good for free market efficiency. Anything that isn't fully optional should be part of the advertised price. The employers and employees have superior information for correct decisions, and once a transaction (dining) has already been committed to a superior position of power as well.