Coca Cola was invented in 1886 by John Pemberton, a pharmacist from Atlanta, Georgia. He concocted the formula in his backyard and sold it originally as a tonic. It contained extracts of cocaine and caffeine. The name was suggested by Pemberton's bookkeeper Frank Robinson, who also designed the iconic script logo. Coca Cola has since produced many variations of their product through different formulas, packaging sizes, and advertisements targeted at both children and teenagers to form lifelong brand loyalty. While prices vary globally, a regular Coke costs around $1.38 and Diet Coke around $1.89 in the author's location. Pepsi is named as a chief competitor of Coca Cola.