This is smart, strategic policy that protects both economies. The yen was severely undervalued, creating unfair trade dynamics, and joint action sent a clear market signal that disorderly currency movements won't be tolerated. With both governments pledging to intervene again without hesitation, this decisive alliance-driven leadership keeps global markets stable.
The intervention wasn't about friendship — it was damage control. Japan holds over $1 trillion in U.S. debt, and a unilateral defense of the yen would've forced massive Treasury sales, spiking yields at the worst possible time. Selling euros to buy yen is a desperate patch on a cracking system, and coordinated intervention at this scale historically signals serious trouble ahead.
There's a 40% chance that the USD will be the dominant global reserve currency in 2050, according to the Metaculus prediction community.
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