Unlike the past, where economics dictated a strong yen despite loose policy, markets are now driven by politics. The Japanese government is allowing the yen to devalue to manage its debt, even as interest rates rise. This weakens the yen, strengthens the dollar, and could fuel a US equity boom via carry trades.

When Japan repatriates its trillions in foreign assets, it will create a massive capital hole in US and European markets. Rather than allowing a painful credit contraction, the Fed and ECB will respond predictably: by printing more money to fill the gap, reinforcing the global inflationary cycle.

The upcoming Bank of Japan meeting is the most critical central bank event, with implications beyond FX markets. A hawkish surprise could create a volatility event in Japan's long-end yield curve, which could easily reverberate across global rates markets, impacting carry trades and broader market stability.

The yen is nearing 160 against the dollar, a key level that has historically triggered intervention. A decisive break could lead to a 'dollar wrecking ball' scenario, causing a cascade of volatility across global currency, bond, and equity markets. This creates a high-stakes 'widowmaker trade' environment.

Investors borrow Japanese Yen at low interest rates to buy high-growth assets like NVIDIA, pocketing the difference. When Japanese rates rise, these investors must sell their stocks to cover the debt, causing a cascade of selling pressure unrelated to the company's performance, revealing global market interconnectedness.

A critical but overlooked risk for the U.S. credit market is rising interest rates in Japan. Japanese banks are major buyers of AAA-rated Collateralized Loan Obligations (CLOs). If domestic yields become more attractive, they may pull back, removing a significant source of demand that underpins the entire leveraged loan ecosystem.

While low rates make borrowing to invest (leverage) seem seductive, it's exceptionally dangerous in an economy driven by debt management. Abrupt policy shifts can cause sudden volatility and dry up liquidity overnight, triggering margin calls and forcing sales at the worst possible times. Wealth is transferred from the over-leveraged to the liquid during these resets.

Because Japan is the largest foreign holder of US debt, instability in its domestic bond market has a direct impact on American consumers. If Japanese bond yields rise, Japanese investors will sell their US treasuries, causing US interest rates to spike and increasing borrowing costs for mortgages and auto loans.

As investors sell US assets to repay strengthening yen loans, it pulls liquidity from the US system. If this happens slowly, it could gently deflate inflated stock prices without causing a crash. This orderly withdrawal is preferable to a sudden market rupture caused by bursting bubbles.