Cola by citric or other isolated acids. Coca-Cola's recipe is maintained as a corporate trade secret. A variety of different sweeteners may be added to cola, often partly dependent on local agricultural policy. High-fructose corn syrup (HFCS) is predominantly used in the United States and Canada due to the lower cost of government-subsidized corn. In Europe, however, HFCS is subject to production quotas designed to encourage the production of sugar; sugar is thus typically used to sweeten sodas. In addition, stevia or an artificial sweetener may be used; "sugar-free" or "diet" colas typically contain artificial sweeteners only. In the 1940s, Coca-Cola
Coca-Cola production and distribution of Coca-Cola follows a franchising model. The Coca-Cola Company only produces a syrup concentrate, which it sells to bottlers throughout the world, who hold Coca-Cola franchises for one or more geographical areas. The bottlers produce the final drink by mixing the syrup with filtered water and sweeteners, and then carbonate it before putting it in cans and bottles, which the bottlers then sell and distribute to retail stores, vending machines, restaurants, and food service distributors. The Coca-Cola Company owns minority shares in some of its largest franchises, such as Coca-Cola Enterprises, Coca-Cola Amatil, Coca-Cola Hellenic Bottling Company,