In the article they call it the "world's biggest easy money scheme", and so it was: you borrow at low rates from Japan, leveraged heavily, and then invest in a higher-yielding something or other elsewhere. A lot of those elsewheres were in Australia, Europe, and US. Now the US rate is going to 1% - once the dollar stops strengthening, a while down the road when risk appetite comes back... will it ignite a USD carry trade?