First in a six-part series

On Dec. 21, the organizers of the Tokyo Summer Games announced that the 2020 sports extravaganza will cost no more than ¥1.8 trillion, boasting of their efforts to save money for the taxpayers in Tokyo and indeed all of Japan.

But even if they manage to keep the price tag that low, it will still be more than twice the initial estimate Tokyo publicized in 2013 when it was bidding to bring the world's biggest sporting event back to Japan.