The US dollar is up by 20% in trade-weighted terms (measured against a basket of its major trading partners' currencies) over the past year, and is close to a 12-year high (see chart). This has been good for American travellers.
But it has hit overseas sales for S&P 500 companies, who now look set to forfeit around $100bn of revenue this year, more than the total earned by Nike, McDonald's and Goldman Sachs combined, say Eric Platt and Kadhim Shubber in the Financial Times.
The dollar bull has undermined commodities, which are priced in the US currency. This in turn has hit growth in emerging markets, some of which are also being squeezed by the rising cost of dollar-denominated debt or by pegging their currency to the dollar (which will make their currencies rise too). Unfortunately for emerging markets and US multinationals, these trends may endure as the dollar climbs further.
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The currency markets "tend to have very, very long cycles", says BK Asset Management's Boris Schlossberg. Deutsche Bank says that only the Japanese yen and Norwegian krone have weakened as much against the dollar at this point, as during the last two major dollar bulls, in the 1980s and 1990s. That suggests further upside.
The fundamentals point the same way. Even if the jitters surrounding China's devaluation of the yuan delay the first increase in US interest rates in almost a decade, the basic picture hasn't changed: America is gradually moving towards tightening monetary policy, while none of its major rivals are, except the UK.
Indeed, the European Central Bank and the Bank of Japan could print more money if they grow more concerned about undershooting inflation targets. China is now weakening its currency. Emerging markets are grappling with structural problems and the prospect of capital leaving their traditionally risky shores, due to the lure of higher yields on US securities. In recent years, moreover, America has reined in its budget and current account deficits, which is also bullish for the currency.
In short, "the dollar definitely has a tailwind behind it", says Schlossberg. Morgan Stanley thinks the dollar is especially likely to perform well against commodity and emerging market currencies and that it will climb to parity with the euro by the end of next year, a rise of 10% from current levels.
