May sound repetitive but if you want prices to go Down buy only the essentials and eat home.
Buying only the essentials and eating at home is great advice. It will undoubtedly reduce "your" expenses, but, unless a huge amount (if not the vast majority) of the populace start doing this, I don't think that prices will stop increasing or "go down" by a significant (if any) amount. Most restaurants, however, would go out of business and no new ones would open.
Fortunately, for those in the restaurant business, this is unlikely to happen. Unfortunately, for those who patronize the restaurants, in the long run they will continue to pay ever increasing prices for the stuff they consume in them, and also, in most cases, with one notable exception, in the long run, they will pay an even greater "price" for the impact on their health and well being.
PS: Although eating at home will result in spending less for food, depending on what they cook and eat, the finincial advantage may be offset by poor (unhealthy) choices of how they cook and what foods they eat.
Even weight loss achieved by cooking and eating at home, though more economical, may not be as beneficial to their well being as they may believe. Making pasta or home baking bread to consume are just two examples. regardless of the "quality" of the ingredientes.