Why doesn't a small village have a supermarket? If it's small enough then it won't have any store at all. Why? Because the business doesn't make enough money to justify it and the consequence of this is that none of the inhabitants of that village can "just go to the store to buy some milk". They either need to plan weeks or months worth of shopping in advance or have access to transport that can take them to a town that has a store.

The owner of FoodCo put in a lot of their money upfront to make the company happen in the first place. Your deli guy wouldn't have a job if the FoodCo guy hadn't done what he did.

I know that it's hard for people from rich (and high population) countries to understand, but the high variety of goods and services that exist are a consequence of people investing into businesses. Without them many of these businesses wouldn't exist, because most people are not rich enough to be able to fund a business on their own.