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Tariff is a word many of us first heard in history class: we remember the Great Depression and the dark side of protectionist trade policy. Fast forward to today and tariffs are once again taking centre stage, serving as the linchpin of President Trump’s trade policy. A fierce debate has emerged over the impact they could have on the global economy — and as a cause of sharply rising market volatility.

Critics argue these tariffs mark the start of a new trade war that will hurt all countries in the end. Supporters say it is an attempt by the US to reduce long-term trade deficits and compel other countries to lower their own protectionist measures. In either case, the rewiring of global trade reflects a larger shift in geopolitical world order that is, in our view, just beginning.

To help make sense of it all, we developed this guide to tariffs and their potential implications for the economy, markets and investors.

1. What are tariffs and how are they used?

Tariffs are essentially taxes on goods imported from other countries. They are used to help protect domestic producers from foreign competition, among other purposes.

We employ a four-box framework to understand the motivations for tariffs and what they could mean for the investment environment. Four main factors — decoupling, rebalancing, negotiating and funding — will influence how the story plays out. For instance, tariffs used for negotiating purposes are unlikely to persist over long periods of time while those part of a larger decoupling process could be here to stay.

Our base case is that the United States can weather changes to trade policies, though higher tariffs would likely dampen economic activity and raise import prices. The US has the advantages of size, economic resilience and consumers with money to spend. Businesses have also ramped up investments in the US, both domestically and abroad from companies eager to maintain access to the world’s largest economy.

However, the ambiguity caused by shifting trade policies is already affecting business and consumer confidence, with potential negative consequences for the US economy and markets.

The fallout for other countries also remains uncertain, particularly those that rely heavily on the US for trade, such as Mexico and Canada, where exports to the US account for around 20% to 25% of GDP. For most European economies, exports to the US make up approximately 2% to 3% of their GDP. If the US imposes tariffs, resulting in lower exports and economic growth for these countries, then we are likely to see looser macroeconomic policy to counter the negative effects. Some governments are responding decisively. Germany, for example, has relaxed its fiscal policy dramatically and laid out plans to increase spending for infrastructure and defense, in part to reduce reliance on exports for growth.

2. Why is the US trade deficit so high?

If there is one number to know about tariffs, it is the US trade deficit for goods. That figure hit $1.1 trillion in 2024 as Americans bought imported products and a strong US dollar weighed on exports. The US has run a trade deficit every year since the 1970s.

Economists note the high trade deficit may be a sign of US economic strength — indicating consumers are buying — but the figure is nonetheless why tariffs are central to Trump’s economic agenda. Other countries rely on global trade far more than the United States, and the administration aims to leverage America’s economic position as a tool to achieve a more balanced relationship with its trading partners.

Still, the US runs the world’s largest current account deficit, which is the counterpart of huge foreign capital inflows into the US. If the US wants to reduce its deficit, it will likely mean smaller capital inflows and a weaker dollar.

Trump’s use of emergency orders to implement or remove tariffs has unnerved markets. Prior administrations have used tariffs to varying degrees, but under laws that required detailed analysis, which allowed more time for companies and stakeholders to respond. Whatever the method, tariffs may represent a pivot to an isolationist-leaning policy that could have long-term ramifications for investment portfolios.

3. Do tariffs cause inflation?

The short answer is yes, but how it plays out is much more complex.

In the event of a one-time tariff, prices would likely increase modestly but then even out over time. A more worrisome development is a trade war scenario, where tariffs ratchet higher year to year. That, in turn, could lead to higher long-term inflation with a knock-on effect of rising interest rates.

Economists agree the cost of tariffs is largely paid for by a combination of consumers and companies willing to accept lower profit margins to sell products. A common estimate is that 30% to 50% of the cost is passed on to consumers, though the rate may be higher for products with fewer substitutes. Recent research has shown that the 2018–2019 tariffs were mostly passed on to US consumers.

Trump’s decision to impose tariffs on imported washing machines, but not dryers, in January 2018, is an often-cited case study from economists at the University of Chicago and the Federal Reserve. The study found domestic US manufacturers raised prices to match competitors, despite not being tariffed. Moreover, prices of dryers also increased as manufacturers may have used tariffs to raise prices opportunistically or split the increases between the washers and dryers.

The value of the US dollar has also changed in reaction to tariff headlines. Higher tariffs generally lead to a stronger dollar since they lower demand for imports priced in foreign currency. Conversely, limiting tariffs lowers the dollar’s value as demand for foreign currency increases. A strong dollar could help offset some tariff-related costs for consumers, similar to the way US tourists benefit from a strong dollar when traveling abroad.

4. What is trade reciprocity and how will it unfold?

At face value, the concept of trade reciprocity is simple: We charge you the same tariffs that you charge us.

The Trump administration aims to rebalance tariffs between the US and other countries to make them reciprocal. Such a move bucks 75 years of multilateral US trade policy and sidesteps rules of the World Trade Organisation, the successor to the General Agreement on Tariffs and Trade (GATT) of 1947.

This change in strategy is happening because the current US administration believes the balance has tipped too far as key American industries face steep barriers to selling their products abroad. Take cars, for example. Auto sales between the US and the European Union favor the latter. The EU currently imposes a 10% tariff on US cars sold in their markets compared to the 2.5% rate imposed by the US on imported European autos.

It is unclear whether Trump’s definition of reciprocity would include value-added tax (VAT) rates charged by many countries on domestic purchases. These rates are generally applied at each stage of production, versus a US sales tax which is levied at the final sale. Many economists argue that VATs are not taxes on imports, so they are not the equivalent of tariffs. In the case of the EU, taking the VAT into account implies a larger effective tariff rate of roughly 25%.

Given the one-on-one nature of these trade negotiations, details matter. Tariffs on major trading partners such as China, the EU, Canada and Mexico can reduce US trade deficits and boost domestic production by giving local firms an edge over imports.

They could also invite retaliation, such as Canada’s removal of US liquor from its shelves. China could ban critical mineral exports to the US, decrease purchases of airplanes and agriculture products, and increase investigations of US-based companies with exposure to China, including Apple, Starbucks and Tesla.

5. What impact did tariffs have during the first Trump administration?

Investors may be experiencing a strong sense of déjà vu as tariffs make headlines. The first Trump administration pursued a similar goal of reducing the trade deficit by imposing tariffs on China. That move sparked a trade war that whipsawed markets and dominated the news, much like now.

In hindsight, the impact on inflation was muted in the aggregate, with the annual consumer price index ranging from 1.50% to 2.85% in 2018 and 2019. The S&P 500 Index declined in 2018 but rallied sharply in 2019, both years driven by factors other than tariffs.

The world has changed since that initial round of tariffs. The impacts of the pandemic, wars in Ukraine and the Middle East, and the greatest inflation shock in decades continue to ripple through the economy. How tariffs and federal spending cuts will affect growth is even more uncertain given the evolving nature of Trump’s policies.

The lesson may be that in times like these, it is important to be clear about what we do and do not know — recognising that tariffs are just one part of the equation. Focusing on investment principles such as diversification and staying invested in the face of market volatility become more essential to achieving long-term investment goals.