Summer Olympic Games demand for tickets to all levels of each event, there was controversy when seats set aside for sponsors and National Delegations went unused in the early days. A system of reallocation was put in place so the empty seats were filled throughout the Games. Rio de Janeiro, Brazil hosted the 2016 Summer Olympics, becoming the third city in the Southern Hemisphere to host the Olympic Games after Melbourne, Australia, in 1956 and Sydney, Australia, in 2000, and the first South American city to host the Olympics. The preparation for these Games was overshadowed by controversies, including the instability of Brazil's
Olympic Games of 2016, costs per athlete are on average US$599,000 for the Summer Games and $1.3 million for the Winter Games. For London 2012, cost per athlete was $1.4 million; for Sochi 2014, $7.9 million. Where ambitious construction for the 1976 games in Montreal and 1980 games in Moscow had saddled organisers with expenses greatly in excess of revenues, 1984 host Los Angeles strictly controlled expenses by using existing facilities except a swim stadium and a velodrome that were paid for by corporate sponsors. The Olympic Committee led by Peter Ueberroth used some of the profits to endow the LA84 Foundation