Some people can't tell Pepsi apart from Coke, while others swear that one is enormously better than the other. However, you'll almost never find a restaurant that sells both — and the reason is much more involved than just personal preference.

As with most businesses, it all comes down to price. The simple answer is that when Pepsi or Coca-Cola signs a deal with a restaurant, it's almost always exclusive — meaning the restaurant must agree in writing that it will not sell other soft drink companies' products.

Statistically, you're more likely to see Coca-Cola products offered in a restaurant versus Pepsi products, at least when it comes to major U.S. restaurant chains. According to a chart by Business Insider, Coca-Cola products outnumber Pepsi products in major chains.