The indicator compares U.S. equities with Japanese equities by dividing a basket of U.S. stocks over a basket of Japanese stocks. When the indicator rises, it means that investors favor the U.S. market, and vice versa when the indicator declines.
Investors tend to favor equity markets where interest rates are increasing relative to the other country. For example, the indicator spiked to its 52-week high in May, when Federal Reserve Chairman Ben Bernanke hinted at winding down stimulus. That led to an increase in the U.S. dollar, which made equities in the U.S. more attractive relative to stocks in other countries.
The indicator isn't very accurate in forecasting if equity markets will rise or fall, but determining which market will be stronger has some implications. The indicator's spike in May showed that investors favored U.S. equities over Japanese stocks.May was the first month since the beginning of the Fed's stimulus program, that the central bank discussed tightening policy. Both Japanese and U.S. equities fell, and the spike higher in the dollar and U.S. interest rates hurt gold and bonds. By inferring from U.S. market leadership that gold and bonds could be in trouble, traders could have shorted commodities and bonds and profited from investor panic when the Fed made its policy statement in May.
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