Model can predict tariff impact ahead of time

(Credit: CAFNR/Flickr)

New research explores the complexity of tariffs as a trade tool in a global economy.

A global trade war initially launched with Trump Administration tariffs on Chinese steel in 2018 indeed boosted domestic steel production. But as analysts learned how higher costs would affect downstream manufacturers—and later affect demand for domestic steel—stock prices for US steelmakers tumbled by almost 50 percent year-over-year.

Researchers cited that anecdote—among many others—in their new work. Their paper also establishes a supply chain model to explain those effects and proposed that, in some cases, the effects were foreseeable when accounting for strategic, multi-party interactions and competition.

“The logic that levying tariffs will help protect and strengthen the corresponding domestic industries is not that straightforward in today’s global economy,” write Lingxiu Dong and Panos Kouvelis in their paper, which was accepted for publication in the journal Manufacturing & Service Operations Management.

When policymakers employ a tariff—a tax on imported or exported goods—as a tool to protect a domestic industry from foreign manufacturing, they may assume the industry operates in a vacuum. The effect of imposing a tariff on, say, soybean exports, however, has ripple effects throughout the supply chain for both soybean farmers and their suppliers as well as for the downstream consumers of soybeans, says Kouvelis, professor of operations and manufacturing management at Washington University in St. Louis.

Following the ripples

In retaliation for earlier US tariffs, the Chinese government imposed a 25 percent tariff on 106 US goods—including soybeans—in April 2018. Chinese buyers of US soybeans, which pork producers often use as feed, have started finding suppliers in Brazil and Argentina, avoiding higher prices.

Thus, the Chinese market begins to dry up for US soybean farmers, possibly forever. Agribusiness firms in South America are expanding aggressively in the region to capture the Chinese market opportunity.

“Suddenly, they realize there’s another sourcing opportunity, and they seize the opportunity,” says Kouvelis.

“Tariffs have short-term benefits and long-term implications that are frequently quite unpleasant. In the long term, firms adjust to the new realities.”

Kouvelis and Dong, professor of operations & manufacturing management, began working on their paper about 10 months after the Trump Administration levied the first tariffs on steel and aluminum imports from all nations, including China, in March 2018.

“It’s a very timely topic,” Kouvelis says. “What we thought as we started reading the stories was that the impact is not that obvious.” Under the theory, tariffs would protect US manufacturers from cut-rate imports of foreign-made steel and aluminum. In theory, US firms could expand, hire and supply more US consumers of steel and aluminum. But that’s not how it works in reality.

“Trade policies such as tariffs have significant implications not only for the industries the policies were intended to protect, but also for the complex supply chain that they are a part of,” Dong says. “The net effect of those reactions on the industry and the supply chain is hard to predict.”

The researchers did not conclude that tariffs were a poor instrument for executing trade policy. Rather, policymakers must be aware of the likely effects if they use tariffs. For example, tariffs may indeed restrict trade with a region of a globe—but that doesn’t mean all the companies within that region will be US firms.

“Companies go where they see the opportunities and the growth,” Kouvelis says. “We are moving towards regional supply chains, and in many cases that might be a desirable supply chain outcome. Shorter and market-focused chains are often argued as agile and lean. But tariffs might not have been the best way to end up there, and they may have caused competitive headaches for some of the US companies.”

Predicting the impact

In their research, the pair developed a number of mathematical models accounting for different variables in the supply chain. They examined where the supplier of raw materials is located relative to the manufacturers of finished goods, for example. Or whether the suppliers or manufacturers have multiple production plants in international locations or localized facilities.

Other variables include the costs of shipping goods or finished products and the ability (or inability) of a company to pivot to new suppliers or production facilities as costs rise.

Throughout their paper, the two researchers share anecdotes about how the tariffs have affected companies and industries. Motorcycle maker Harley-Davidson, for example, experienced higher production costs in the United States, thanks to steel and aluminum tariffs and an increase of $2,200 per bike from shipment costs resulting from European retaliatory tariffs. The company ended up shifting some of its production to Europe to better deal with such cost increases.

The model Kouvelis and Dong created would predict what is actually happening: US carmakers are shifting production to China, especially so for the lower-end car models—employing more Chinese workers and fewer US workers.

Meanwhile, the researchers captured the complexity of the auto industry, where US-made cars may be using Chinese components that US tariffs potentially affect, while Chinese tariffs also affect the final products the US exports to China.

The model Kouvelis and Dong created would predict what is actually happening: US carmakers are shifting production to China, especially so for the lower-end car models—employing more Chinese workers and fewer US workers. US production facilities will be further de-labored through flexible automation.

“We can tell you in stories after the fact some of the impact, but we need a model that predicts the direction of change and explains the stories,” Kouvelis says.

“What are the factors you have to think about so you can predict the move before it happens—rather than being a Monday morning quarterback?”

Source: Washington University in St. Louis