Canada-U.S. trade war, rising rates and debt: What stock market investors need to know

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I just returned from my summer holidays after deliberately stepping away from the markets and the daily news cycle. Every year, I find value in creating some distance from the constant stream of headlines, earnings releases, economic data and political commentary. The goal is simple: reset my big-picture thinking, challenge my internal assumptions and reduce the influence of what may ultimately prove to be short-term noise.

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While the break was refreshing, I have to admit it was difficult to completely disconnect given the escalating trade tensions between the United States and Canada. The steady stream of tariff threats, negotiations and retaliatory measures continued to dominate headlines, adding another layer of uncertainty for businesses, consumers and investors alike.

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The longer this dispute remains unresolved, the greater the risk that companies delay capital spending, manufacturers rethink supply chains and hiring decisions are postponed until there is greater clarity. Businesses can adapt to many challenges, but uncertainty is often the most difficult variable to manage.

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The risks are particularly acute for Canada. Roughly three-quarters of Canadian merchandise exports are destined for the United States, making continued access to our largest trading partner essential for economic growth. Yet for years we have made it increasingly difficult to develop and export our own natural resources. Policymakers continue to talk about diversification, but diversification requires pipelines, ports, infrastructure and investment. Without them, Canada enters trade negotiations with fewer options and less bargaining power than it should have.

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As a result, escalating trade barriers have the potential to weaken business investment and reduce export competitiveness, placing additional pressure on an economy already struggling with weak productivity growth and elevated household debt. Export-oriented regions such as British Columbia, Ontario and Quebec would likely feel the impact first, but the effects would ultimately spread throughout the economy through slower growth, softer labour markets and weaker business confidence.

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The United States is not immune either. While its economy is larger and less dependent on exports, tariffs effectively act as a tax on businesses and consumers. Higher import costs can squeeze corporate margins, increase prices and add inflationary pressure at a time when policymakers are already trying to balance economic growth with price stability. Many American manufacturers also rely on Canadian energy, raw materials and intermediate goods, meaning disruptions can ultimately raise costs and reduce efficiency across supply chains on both sides of the border.