Most economic sectors have concentration ratios around 40%, meaning that the top four firms in the industry control 40% of the market. If the concentration ratio is above 40%, experts believe competition can be threatened and market abuses are more likely to occur: the higher the number, the bigger the threat.
On the restaurant side, the ten largest fast food corporations account for 47 percent of all fast food sales, and the love affair that Americans have with fast food does not appear to be in danger of ending any time soon.
If you don;t mind the 3rd world mouth-breather spitting in your food, gringo.