In my opinion, the most profitable business is the food business. It is never affected by recession and inflation, the demand will never go down, in fact it will always go up (because of the increasing population). It is not just a necessity, but also a luxury (because food is one of the pleasure-triggering factors) and people eat foods not just to get energy but also to enjoy. Sadly, if you take a look at the billionaire club, many people are not directly linked with the food business.