Paul Musson, founder of Paddington Capital Management and author of Capital Offence: Why Some Benefit at Your Expense, has issued a stark warning to investors in artificial intelligence: the current boom is a bubble. Speaking on the Zero Sum podcast, Musson argued that decades of loose monetary policy have inflated asset prices while eroding affordability and widening the gap between asset owners and the rest of the population.
The backdrop is a US national debt that has climbed to $40 trillion. Musson acknowledged that a large debt is not necessarily unsustainable if economic growth outpaces borrowing. However, he expressed concern that policymakers are increasingly relying on financial repression—a mix of money supply expansion, artificially low interest rates, and inflation that erodes the purchasing power of creditors—to manage the burden.
Musson pointed to Donald Trump's suggestion that inflation could help reduce the debt burden. He argued that such an approach would not eliminate the cost of government borrowing but would transfer it to bondholders and savers. "Well, it gets rid of the debt at the expense of all the people who own those bonds, right?" he said. In his view, reducing the real value of public debt through inflation shifts the economic cost to financial asset holders rather than solving the underlying problem.
Musson's harshest criticism is reserved for the policy focus on asset prices, particularly housing. He said policymakers have treated rising stock and property prices as a way to stimulate economic activity, assuming households would feel wealthier and spend more. He described this as sacrificing the real economy on the altar of higher asset prices. The problem, he argued, is that rising house prices do not create additional productive capacity.
Using his own home in a Toronto suburb as an example, Musson noted that its nominal value has quadrupled since 2001, yet the house has not grown or changed its economic function. "A house is not a productive asset," he said. This, he argued, represents a transfer of wealth from younger buyers to existing owners, rather than the creation of new wealth for society. The consequences extend beyond property: when housing becomes less affordable, younger households have less flexibility to save, invest, and start families.
Musson also cited data attributed to the Federal Reserve Bank of New York on equity ownership. According to the figures, the share of equity mutual funds owned by households in the 50th-to-90th income percentiles fell from 20% in 2001 to 12%, while the top 10% increased their share from 79% to 87%. The bottom half of Americans owned just 1% of equities and mutual funds, down from 2% in 2001. Musson attributed much of this shift to monetary policies that lowered interest rates and supported financial asset prices.
Musson stressed that wealth inequality is not inherently wrong in a market economy, as long as it reflects differences in what people produce or the value they create. "So the income wealth disparity is okay as long as it's fairly earned," he said. His objection is to gains driven by policies that inflate asset prices without a corresponding increase in productive output. A rising stock market can make existing investors wealthier without improving living standards for households that own few financial assets.
Turning to artificial intelligence, Musson gave a direct answer when asked whether the boom is a bubble: "Well, yeah, it's definitely a bubble." However, he did not dismiss the technology itself. He said AI is changing the world and will likely continue to do so, possibly at an accelerating pace. His concern is whether investors can identify the companies that will ultimately benefit and whether the returns will justify the enormous sums being spent on infrastructure.
Musson's warnings come as AI-related stocks face increasing scrutiny over valuations and capital expenditure. While he acknowledges the transformative potential of AI, he cautions that the investment boom may not deliver the expected returns for all players. The debate over whether AI is a bubble or a genuine revolution continues to divide investors, but Musson's perspective adds a critical voice to the conversation.
This article is for informational purposes only and does not constitute financial advice.
