Charles Lister Smith says market bubbles can take shape when a wave of new stock offerings strains demand. The New York-based economic researcher argues that markets have moved from euphoria into congestion as new securities approach.

In an interview with The Financial Post, Smith said his model implies a decline of approximately 44 per cent in U.S. stock prices if Anthropic’s planned IPO is fully executed. That outcome is his estimate, not a confirmed market forecast.

Market Bubbles and New Stock Supply

Smith’s paper, “Architecture of a Bubble,” adapts the Kindleberger-Minsky model, which describes a cycle of mania, panic and crash. He reframes its stages around the market for new issues, including euphoria among issuers and congestion as underwriters bring out stocks while prices rise.

He said the equation compares what the market can sustain with the price after new supply arrives. Smith described the difference as the potential decline. His framework treats a 40 per cent drop in equity prices as a bubble threshold, while also calling that level an indicator rather than a precise measurement.

Smith said the current market has passed its top because significant supply is expected in less than 30 days. He pointed to Anthropic’s IPO as unusually large and said its offering would exceed the IPOs in most years on record. The source describes the filing as having happened the previous week, but gives no calendar date.

How the Estimate Uses Supply and Rates

The formula includes an overhang of new securities that Smith measures at 7.1 per cent. The calculation combines US$3.5 trillion of equity from coming IPOs, led by Anthropic, with a US$1.9 trillion deficit projected for fiscal 2027, then compares the total with the Russell 3000’s US$75.6 trillion market value.

Smith uses a 5.9x price impact for that supply. The article attributes estimates that each dollar moving into or out of stocks changes market value by roughly US$4.70 to US$5.90 to economists Xavier Gabaix and Ralph Koijen. Smith said he uses the upper bound because panics lack a marginal buyer willing to pay the maximum price, and outsized volumes often accompany steeper declines.

He also connected the outlook to long-term rates and Treasury auctions. Smith said rising government financing needs could push rates higher, drawing money away from stocks. He said the Federal Reserve’s actions are the main factor that could change his equation.

Smith’s Suggested Portfolio Response

Smith advised Canadian investors to rotate stock portfolios into short-term government securities with durations between three and 12 months. He named U.S. Treasury Bills and, preferably, Canada Treasury Bills, which he said face fewer of the same deficit risks as U.S. securities.

He cautioned against long-duration holdings if rates keep rising. In his example, an investor buying a 10-year note could lose value if yields rise and the note must be sold before maturity. He described a three-month security held until stock prices decline further as the safest choice in his view.

Smith said he was not predicting a sudden “crash” but a market top followed by prices drifting down slowly. He said what follows will depend on how people and the government react. His analysis frames new issuance and Treasury auctions as the next developments investors should watch.

Investors weighing that warning can compare it with long-term investing strategies and broader conversations about proactive wealth planning. Readers can also review Anthropic’s disclosed investor risks. The source does not establish that Smith’s forecast will occur.