Why Are Elizabeth Warren and Donald Trump Trying to Weaken the Dollar?

A strong dollar makes America strong. Any campaign to devalue it is likely to backfire.

Elizabeth Warren’s “economic patriotism” differs in style and content from Donald Trump’s economic nationalism, but they have found common cause in vows to weaken the dollar. That is a strangely self-defeating agenda for patriots or nationalists of any political fashion.

Mr. Trump and Ms. Warren argue that China and other emerging rivals weaken their currencies to promote exports and gain jobs, so why shouldn’t America follow a similar policy? Here’s why: Because America is not an emerging country. It’s an unrivaled financial superpower, a position built in large part on hard-won trust in the dollar, which is an enduring source of American power and prosperity.

When the dollar strengthens and weakens in response to buying and selling in the global currency markets, foreign countries don’t protest. Occasionally they have cooperated with the United States to stabilize the dollar. But nothing will destroy trust in American financial leadership, and the benefits that go with it, more surely than for the United States government to start unilaterally manipulating the dollar for its own competitive advantage.

If Vietnam or South Korea manipulate their currencies in a bid to improve their exports, a few of their trade partners may retaliate; if the financial superpower plays the same game, the whole world will respondbecause the dollar is the international standard. A record high 60 percent of countries now measure, or “anchor,” the value of their own currencies against the dollar. Any campaign to devalue the world’s anchor could set off a destructive wave of competitive devaluations.

After World War I, when America challenged Britain as the leading global empire, the dollar began gaining on sterling as the currency that most central banks preferred to hold in reserve. Reserve currency status had long been a perk of imperial might — and an economic elixir. By generating a steady flow of customers who want to hold the currency, often in the form of government bonds, it allows the privileged country to borrow cheaply abroad and fund a lifestyle well beyond its means.

Other countries watched the United States assume this role with dismay. In the 1960s, Valéry Giscard d’Estaing, then finance minister and later president of France, called the dollar’s powerful status America’s “exorbitant privilege.” And for nearly a century now this privilege has helped to keep United States interest rates low, making it possible for Americans to buy cars and homes and, in recent decades, run large government deficits that they could not otherwise afford.

Trump’s Trade Levers Test Long-Term U.S. Alliances

President’s threats against Mexico and others can work in the short run, but global rules could be strained

President Trump’s threat to hit Mexico with tariffs over immigration is the latest and most dramatic step in the weaponization of international economic levers.

In the short run, these moves may serve the U.S. interest. But in the long run, they could do the opposite, by emboldening everyone to ignore international conventions and rules that reserved tariffs and sanctions for specific purposes. The U.S. may also find its “soft power,” the ability to get other countries to cooperate out of shared mutual interest rather than threat, diminished.

Mr. Trump is not the first president to use trade levers to achieve unrelated goals. Congress has granted the president authority to do so in successive statutes, starting with the Trading with the Enemy Act of 1917. These laws enabled Presidents Roosevelt to declare a bank holiday in 1933, Nixon to impose a 10% tariff on foreign imports and Reagan to sanction Nicaragua.

But Mr. Trump’s trade maneuvers have been different in several ways. First, the extent is unprecedented: Last year, he used national-security justifications to impose tariffs on steel and aluminum imports, even from allies, and is threatening the same with autos. He then doubled tariffs on Turkish steel to force that country to release an American pastor. He has imposed new sanctions that would severely penalize any foreign or U.S. company that does business with Iran. A new order barring U.S. companies from doing business with China’s Huawei Technologies Co. because it could be a conduit for spying is ensnaring foreign companies as well.

“There’s nobody like this in the last century,” said Gary Hufbauer, a trade expert at the Peterson Institute for International Economics.

Second, the president has used these powers to achieve narrow goals with little connection to the economic imbalances or national-security threats for which they were intended. In 1985, Mr. Reagan imposed sanctions on Nicaragua using the International Emergency Economic Powers Act of 1977, the same authority Mr. Trump invoked for his tariffs on Mexico. But the U.S. regarded Nicaragua as a hostile client-state of the Soviet Union. Similarly, Mr. Reagan imposed sanctions on construction of a natural-gas pipeline from the Soviet Union to Western Europe for fear it would make American allies vulnerable to Soviet economic blackmail.

Mr. Trump’s actions don’t flow from an overarching geostrategic vision: His tariffs on imports of steel, aluminum and, potentially, autos are designed primarily to shore up favored domestic industries. His threat toward Mexico came because he says it hasn’t done enough to stem the flow of Central American asylum seekers traveling north to the U.S. border. And while his tariffs on China and his sanctions on Huawei superficially resemble Mr. Reagan’s efforts to contain the Soviet Union, Mr. Trump’s calculus is more transactional. He has suggested, for example, that the case against Huawei, which U.S. officials say is motivated by national security, might be dropped as part of a trade deal.

In the near term, these tactics can work. His assumption that other countries will prioritize retaining access to the U.S. market has generally proved correct. Mexico has so far been restrained in responding to his tariff threat. Though U.S. allies haven’t joined its sanctions on Iran—designed to halt all its nuclear activity and support for Syria’s government and groups the U.S. considers terrorists—the threat of American penalties has dissuaded their companies from resuming business there. As a result, Iran’s economy is cratering. Similarly, several Western European companies have suspended business with Huawei even as their governments don’t view it as the threat the U.S. does.

Yet in the long term, these actions, with other trends, likely will weaken ties between the U.S. and its allies and the security and leverage all derive from acting together.

The Pew Research Center has found a growing share of Republican voters, like Mr. Trump, are skeptical that openness to the world or deference to allies serve U.S. interests. And many countries are moving in a similar direction. Nationalists now govern India, Israel, Brazil, the Philippines, Poland, Hungary and Italy, and Chinese President Xi Jinping espouses a more bellicose, China-first agenda than his predecessors. Because they define national interest in the same transactional terms as Mr. Trump, they are more likely to defy the U.S. if it suits their immediate needs. The Philippines, for example, has courted Chinese investment, and Italy has welcomed Huawei. Despite Mr. Trump’s personal fondness for Indian Prime Minister Narendra Modi, India has sought to circumvent the U.S. crackdown on trade with Iran, while the U.S., unhappy with Indian protectionism, has withdrawn tariff preferences from India.

Even countries still ideologically allied with the U.S. will question the value of doing deals if, as with Mexico, they fail to prevent unilateral punishment for nontrade matters.

“As Trump shreds international trust in the U.S., friendly countries have to start preparing Plan Bs: alternatives to relying on America,” said Robert Zoellick, the U.S. trade representative under George W. Bush and later World Bank president. “This shift won’t occur overnight, but the erosion is increasing rapidly, and the negative dynamic weakens U.S. influence.”

The Iran sanctions are an early sign of this diminished leverage. Other countries, tired of how the U.S. uses the dollar’s role in global payments to enforce unilateral sanctions, are devising workarounds. The U.K., Germany and France are building an alternative payments system for dealing with Iran, which has meanwhile begun expanding its stockpile of enriched uranium.

The political trends weakening U.S. leverage with the world are compounded by economic trends. Since 1985, the U.S. share of global gross domestic product has shrunk to 24% from 35%, while China’s has grown to 16% from 3%. This means other countries have less to gain by cooperating with the U.S. and more to lose from antagonizing China.

If U.S. tariffs, real and threatened, shrink trade and investment flows, that would further diminish economic incentives to cooperate, while also weakening the constituencies in other countries favoring openness and integration with the U.S.

But that argument can’t be applied to other countries targeted by Mr. Trump. Aaron Tornell, a Mexican-born economist at the University of California, Los Angeles, noted that since the 1980s, Mexico has turned away from left-wing isolationism toward liberalized markets and closer cooperation with the U.S. on trade and security issues such as narcotics. Advocates in Mexico of this integration argued American presidents and big business would prevent the U.S. from using its enhanced leverage to punish Mexico.

Mr. Trump’s policies could “destroy the political foundations of a country that has been following liberal economic policies for the last 30 years and give more power to those who want to be like Venezuela,” Mr. Tornell said.

The Risks in Overusing America’s Big Economic Weapon

Alienated nations will be moved over time to establish alternatives to the U.S.’s systems and markets

But there is a real underlying risk that by deploying and using its economic weaponry so frequently the U.S. will, in the long run, drive others, friend and foe alike, away from its economic orbit. “These are not zero-cost options,” says Robert Hormats, former under secretary of state for economic affairs and an adviser on international economics for presidents going back to Richard Nixon.

Imposing tariffs on China and other nations trying to send their goods to the U.S. not only raises the prices of those products for Americans, it also gives targeted nations an incentive to develop markets, and long-term trade ties, in other countries.

At the same time, those foreign nations can retaliate by cutting purchases of American goods, or by slapping retaliatory tariffs of their own on American products, making them less competitive, as China has just announced it will do. The Chinese may find other countries to provide, say, wheat and soybeans, and in doing so develop lasting, non-American trade ties.

If the U.S. develops a reputation as an unreliable supplier, countries will turn to our competitors, and, when sanctions end, earlier supply chains will be difficult to restore,” says Mr. Hormats.

.. Similarly, there is a danger the U.S. is providing both allies and adversaries an incentive to find ways around using the American financial system as the wiring for international commerce.

For now, there are few alternatives to using American banks for clearing international transactions. As a result, enemies find they can be shut out of much international commerce by crossing the U.S. and being slapped with American sanctions.

But it isn’t just enemies. Friends also know their companies can be isolated if they don’t heed American wishes to shut down commerce in countries on the American black list. The risk of losing access to the financial system is a powerful motivator.

Yet overuse of this threat could compel other counties—including the very allies whose cooperation the U.S. seeks in applying financial pressure to the bad guys—to find alternatives to using dollars and American banks. Mr. Hormats notes that this “is not easy to do now, given the dollar’s pre-eminent role, but over time such overuse could eat away at the dollar’s role and hence U.S. leverage.

Indeed, there are signs that others are seeking alternatives to the dollar and the American-led financial network. The European Union is trying to set up its own payment system to allow oil companies and businesses to continue trading with Iran despite American sanctions. China has made clear it would be happy to lead a different international finance system and use its currency as an alternative to the dollar.

Similarly, 11 Pacific Rim allies have moved ahead with their own new trade bloc after the U.S. pulled out of the Trans Pacific Partnership trade deal.

America remains the big kid on the economic block, but it isn’t the only one. The danger is that it could come to be seen as the bully who tries to intimidate the other kids once too often, persuading them to join together to find ways around him.