Yen Swings as Markets Digest Bank of Japan’s Rate Path - WSJ

The Japanese yen moved sharply in both directions as investors assessed the Bank of Japan's shifting policy stance. The currency's volatility reflects genuine uncertainty: market participants are trying to gauge how quickly the BOJ might adjust interest rates after years of ultra-loose policy, and each new signal from the central bank prompts rapid repositioning.

For global markets, the yen matters well beyond Japan's borders. It has long served as a funding currency for carry trades, in which investors borrow cheaply in yen to buy higher-yielding assets elsewhere. When the yen swings, those positions can become more expensive to maintain, and abrupt moves can ripple into other markets as participants adjust their exposure.

What to watch going forward: BOJ communications for clearer guidance on the pace of any policy normalization, Japanese wage and inflation data that inform the bank's decisions, and the interest-rate differential between Japan and other major economies — a key driver of currency moves. Until the rate path becomes clearer, further yen volatility appears likely.