In his new book "Super Sad True Love Story", the novelist Gary Shteyngart depicts a future in which an overstretched America depends on the forbearance of its Asian creditors. That scenario is not, sadly, a great test of the author's imagination. In this fictional world, America's currency and China's are still closely linked. But nervous Americans peg their greenbacks to the yuan (worth about $4.9), not the other way around.
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