Planet Money had a podcast dedicated exactly to this case. Not so in-depth but I would highly recommend listening to it for a good explanation of the policy that was followed.
[https://www.npr.org/sections/money/2015/12/02/458222801/episode-216-how-four-drinking-buddies-saved-brazil?t=1611427574666](https://www.npr.org/sections/money/2015/12/02/458222801/episode-216-how-four-drinking-buddies-saved-brazil?t=1611427574666)
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