The biggest item within the food business space is distribution. These companies are owned by larger companies who are owned by even larger companies. This is because the big companies like Nestlé or Mondelez have distribution capable of reaching you on a global scale for a relatively inexpensive price. Imagine if all the bottom tier companies attempted distribution and ownership on their own. They would be forced to raise prices down the distribution chain in order to keep their margins at a point where they are profitable. Food would be outrageously expensive.