Why are there four workers in a Supermarket, and what changes if I fire some of them?

In the Tropico 4 DLC Modern Times, you get a Supermarket: it's like a Marketplace in that it serves as a food-distribution point (so people don't have to hike out to the farms), but can store more food, change the type of food it sells (healthy/junk food), and employs 4 people. Marketplaces only ever require a single worker, and I haven't yet seen people starving because they were waiting in line.

In some Modern Times campaign missions, you start with a Supermarket. Early in a game, tying up four high-school-educated workers in a Supermarket is a waste of educated workers. I usually fire three of them so I can use those educated workers elsewhere, but what's the effect of this on the building's services? Do fully-staffed Supermarkets serve people faster, or have a higher service quality, or serve higher-quality food, or what?

Solution 1:

It would appear that the number of workers has an effect on it's work modes.

Lyubo_Haemimont Wrote: The number of workers does have a significance in the Supermarket. Mainly for the effects of its work modes.

Since the work modes affect food quality vs. life expectancy, more workers would make that Junk food / Healthy food choice more meaningful.

Solution 2:

Firing workers in a building always decreases the amount of people that can be served at the same time or reduces the amount of goods produced per cycle.