The US dollar index, which tracks the greenback’s progress against a basket of trading partners’ currencies, has leapt by over 8% to a four-year high in the past three months. On a longer-term basis, however, the dollar’s performance has been less impressive.
Indeed, it has been on a downtrend since the 1980s, when it hit a record 150 on the index, and the last major dollar bull market was in the 1990s. The latest surge makes up very little of the lost ground.