Bullish Now, Bumpy Ahead: Tariffs, Stimulus, and the Shadow of Inflation

The late-summer calm in financial markets shows an undercurrent of optimism. Stocks have been on a tear, with the S&P 500 rebounding strongly to notch roughly 18% gains for the year, while overseas equities are up even more.

Major indices have powered to new recovery highs thanks to robust earnings and hopes that policymakers will keep the punchbowl flowing. Indeed, in the near-term markets remain buoyant and could stay that way, supported by a confluence of pro-growth policies and easing anxieties about interest rates. But this sunny short-term picture has its shadows. We see gathering risks that could spark a medium-term correction – chiefly the lagged bite of recent trade tariffs and policy uncertainty that has companies hesitant to invest.

Still, even if growth sputters, we expect any slowdown to be transitory. Washington continues to step on the gas with fiscal stimulus and deregulation, providing a powerful backstop that should re-accelerate the economy after a brief dip. The flip side is that these very measures sow the seeds of future challenges: long-term, the policy mix points to higher inflation and an era of negative real interest rates. In effect, the U.S. may increasingly rely on quietly “repressing” financial conditions – keeping rates below inflation – to manage its towering debts. In this update, we unpack this trajectory: from today’s market strength, through the potential correction and rebound, to the ultimate consequences for prices, rates, and investors.

At present, markets are displaying remarkable strength. After a wobble earlier in the year, equities have rallied hard over the spring and summer, leaving indexes near record territory. The S&P’s surge off the April lows led by tech high-fliers and even a renaissance in small-cap stocks – has restored confidence and then some. By the end of August, U.S. stocks were up in double digits year-to-date, and foreign bourses even more so. Credit markets have been cooperative as well: corporate bond yields remain contained, and volatility has ebbed, creating an environment where risk-taking is being rewarded. Several factors are driving this exuberance.

First, fiscal policy has turned decisively expansionary, delivering a jolt of adrenaline to the economy. The passage of the massive “One Big Beautiful Bill Act” in June – a sweeping $2.4 trillion package funding everything from border security to infrastructure – signaled to markets that Washington is willing to spend freely to keep growth on track. This bill alone is pumping roughly $350 billion directly into projects and programs, and it came paired with an increase in the debt ceiling that removed any immediate constraints on federal spending. The result is a pro-cyclical fiscal thrust rarely seen in peacetime: the budget deficit for fiscal 2025 is projected at about $1.9 trillion, or 6.2% of GDP. That kind of stimulus – far above historical norms – is helping buttress corporate earnings and consumer spending, even as the private economy works through some softer patches.