Olympic Games profits from the Olympic symbols. The IOC also takes a percentage of all sponsorship and broadcast income. Host cities continue to compete ardently for the right to host the Games, even though there is no certainty that they will earn back their investments. Research has shown that trade is around 30 percent higher for countries that have hosted the Olympics. The Olympic Movement uses symbols to represent the ideals embodied in the Olympic Charter. The Olympic symbol, better known as the Olympic rings, consists of five intertwined rings and represents the unity of the five inhabited continents (Africa, America, Asia,
Olympic Games bout, but his receipt of the prize money raised suspicion. In the early 20th century, many Olympic athletes began using drugs to improve their athletic abilities. For example, in 1904, Thomas Hicks, a gold medallist in the marathon, was given strychnine by his coach. The only Olympic death linked to performance enhancing occurred at the 1960 Rome games. A Danish cyclist, Knud Enemark Jensen, fell from his bicycle and later died. A coroner's inquiry found that he was under the influence of amphetamines. By the mid-1960s, sports federations started to ban the use of performance-enhancing drugs; in 1967 the IOC