Canada's main stock index climbed on Tuesday, lifted by a rally in AI-linked technology stocks, but the day's most important signal for investors may have come from the bond market, where traders increasingly expect the Bank of Canada to raise interest rates next week.
The S&P/TSX Composite rose 0.62%, with the technology sector gaining 0.9% as strong earnings from U.S. tech giants revived interest in artificial intelligence-related names. Shopify, the e-commerce platform that has become a bellwether for Canadian tech, gained 2%, while BlackBerry jumped 6.3%.
Financials, the index's heaviest sector, also rose 0.8%, giving the benchmark a second tailwind beyond tech. But the bigger signal for Canada's market was in rates: the 10-year government bond yield fell for a second session to 3.869%, even as LSEG data showed traders pricing an 80% chance of a Bank of Canada hike next week.
Why the yield curve matters
When short-term rate expectations rise while longer-term yields fall, the gap between them narrows. That flattening of the yield curve can have a significant impact on how investors value different parts of the stock market.
Canadian banks, for example, earn much of their profit from the spread between what they pay on deposits and what they earn on longer-term loans. A flatter curve can squeeze that lending margin, even if the central bank raises its policy rate. That's why financial stocks, despite their gain on Tuesday, may face headwinds if the curve keeps flattening.
On the other side, lower long-term yields can support rate-sensitive sectors such as utilities, which rose 0.7% on the day. That's because utilities and other companies with steady, long-dated cash flows become more attractive when the discount rate used to value those future profits falls.
In other words, TSX leadership can quickly rotate depending on whether the curve keeps flattening or starts to steepen again. Investors who focus only on the headline index move may miss the underlying shifts in market dynamics.
AI optimism vs. rate reality
The tech rally on Tuesday was part of a broader global trend, as strong U.S. earnings revived interest in AI-related names. That optimism has been a key driver of equity markets worldwide, and Canada's tech sector has benefited from the same wave. For a deeper look at how AI optimism is moving markets globally, see our piece on Asia stocks rising on AI optimism.
But the Bank of Canada's expected move is a reminder that monetary policy remains a powerful counterweight. If the central bank does hike next week, it would mark another step in its fight against inflation, and higher short-term rates could eventually cool the very enthusiasm that is driving tech stocks higher.
For everyday investors, the key takeaway is that the TSX's gains are not uniform. While tech and utilities may benefit from AI optimism and lower long-term yields, banks and other rate-sensitive sectors could struggle if the yield curve continues to flatten. That's why it's important to look beyond the headline index and consider how different parts of your portfolio might be affected.
What to watch next
All eyes will be on the Bank of Canada's decision next week. If the central bank delivers the expected hike, the immediate reaction in stocks and bonds will be telling. A further flattening of the yield curve could put pressure on financials, while a steepening might signal that investors see the rate hike as a one-off.
Also worth watching is the path of long-term yields. If the 10-year yield continues to fall, it could support rate-sensitive sectors like utilities and real estate, but it might also signal that investors are worried about economic growth. That's a classic tension in markets: good news for stocks can be bad news for bonds, and vice versa.
For those looking to understand how rate moves affect borrowing costs, our piece on Canada's cooling mortgage borrowing offers useful context. And for a broader view of how earnings and bond jitters are playing out, see our analysis of global stocks and jittery bonds.
Ultimately, Tuesday's session was a reminder that markets are never one-dimensional. AI optimism can lift tech stocks, but the bond market is telling a different story about the path of interest rates. For investors, the challenge is to balance both signals.
