Written by: Alex DrydenWith the U.S dollar having strengthened 6.6% in the last six months, investors are beginning to question whether the dollar has fundamentally changed direction after declining in 2017. We believe that despite the recent jump, the direction of the U.S dollar will be down from here over the long‐term. The three big drivers of currency performance ‐ interest rate differentials, the “twin deficits” and government policy – all suggest a weaker dollar is warranted.With interest rates in the U.S. significantly higher than rates in the rest of the world, international savers have been flocking to the U.S. markets chasing higher rates of return. This has pushed up the value of the dollar over time, as the demand for dollars has increased (see chart). While interest rate differentials have been responsible for much of the increase in the value of the dollar over the last few years, there are signs this may be changing. With global central banks expected to tighten monetary policy in the next 12‐months, the interest rate gap should begin to close, slowly dragging down the dollar.The “twin deficits,” the trade and budget deficit, can also be a drag on the value of a currency over time. The U.S. currently runs a trade deficit of 2.5% of GDP and a budget deficit at 3.5% of GDP. Combined, these result in dollars being pumped into the global economy, pushing down the value of the currency over the longer term.Like deficits, over time, government policy can also have an impact on the value of a currency. In the U.S., for the last 30 years, both Republican and Democrat administrations have pursued a ‘strong dollar’ policy, opting to sacrifice export growth in order to keep a lid on the price of imported goods. However, the current administration seem to be in favor of a weaker dollar. While a government does not have direct control on the value of a currency, they can influence its value via policy and trade decisions.Related: The Portfolio Implications of Trade Disputes The three major drivers of the U.S. dollar suggest that the direction of the dollar will move lower over the long‐term. For investors, a weaker dollar will help lift the returns of unhedged international holdings, as well as benefit American companies with significant overseas exposure.