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Organizers may promise an economic boom, but the Games often leave big debts.
The organizers of the Nagano Olympics in Japan made big promises about increased tourism in the wake of the Games. But after the closing ceremony, the crowds never really came back.
To make matters worse, the city went over its original budget by 56%, according to the Oxford researchers.
Allegations of corruption were leveled and entire boxes of financial records were reportedly burned. The cost of luring the games to Nagano remains unknown.