A Path Higher For The U.S. Dollar: A Shrinking Trade Deficit

 | Jun 11, 2018 04:45AM ET

It is increasingly clear that President Donald Trump and his administration will relentlessly pursue a goal of balanced trade with the rest of the world. Trump sees negative trade balances as an absolute bad, and a significant improvement in the U.S. trade balance should provide a strong tailwind to the U.S. dollar.

At a basic level, a negative trade balance (deficit) increases the supply of a currency in the global financial system and, all else being equal, drives down the relative value of the currency. The country with the deficit sends its currency into the market (an increase in supply) in exchange for goods. A positive trade balance (surplus) decreases the supply of a currency in the global financial system and, all else being equal, drives up the relative value of the currency. The country with the surplus sends goods in exchange for its currency. The buyers of those goods create demand for that currency in order to purchase the goods.

Of course, in the real world, there are a LOT of factors that impact the value of a currency and the size of a trade balance. Sometimes countries pursue policies which deliberately weaken their currencies in order to support exports of goods. In extreme cases, like Switzerland, governments will actively intervene in currency markets to achieve trade goals. The measurability of the impact of currency policy on trade outcomes is hotly debated (for example, see “‘Currency manipulation’ and world trade “).

Still, from 2000 to 2014, the U.S. experienced a very strong correlation between its trade balance and the relative value of the U.S. dollar. The big break in 2014 occurred as the European Central Bank (ECB) aggressively dropped its policy rate into negative territory and ramped up quantitative easing efforts just as the U.S. was preparing to go in the opposite direction. The direct correlation seems to be in the process of re-establishing itself in the last two years so. In the chart below I used the dollar index measured against major currencies as this is closest to the tradable U.S. dollar index (DXY).