The market’s greatest challenge this week is that several seemingly independent trading themes are beginning to interact with one another: the yen has reached a six-month high; expectations of a Bank of Japan rate hike are building; global bond yields are broadly rising; signs are emerging of a rebound in China’s crude-oil demand; and expectations for Federal Reserve policy have once again been unsettled by comments from Donald Trump. When these variables move simultaneously, markets rarely deliver a clean, smooth one-way trend. Instead, they are more likely to enter a high-volatility, range-bound phase marked by repeated swings in both directions. The key variable to watch now is whether the yen can make a further near-term directional break. This matters not only for the U.S. dollar inde