Gold fell 3.5% on Monday, September 28, settling at US$4,168.40 an ounce on the December futures contract, its lowest level since August 5, while Brent crude briefly topped US$107 a barrel after Washington rejected an Iranian proposal to reopen the Strait of Hormuz. An escalating war lifted oil and sank the asset most investors file under protection against war. That gap between the label on the asset and the behaviour of its price is where investor psychology is being tested this morning.
The mechanism was rate expectations, not battlefield sentiment. Higher oil raised inflation fears, and markets now put roughly 70% odds on a second Federal Reserve hike at the October 28 meeting, according to CME FedWatch data cited by Trading Economics. The 10-year U.S. Treasury yield rose to 5.234% on Monday, CNBC reported, after touching its highest level since June 2007 last week. Gold pays no yield, so a rising return on cash and bonds is a direct cost of holding it.
Mental Accounting Gave Gold a Job Description It Cannot Always Fulfil
Richard Thaler, in his 1999 paper on mental accounting, described how people sort money into separate mental accounts, each with its own purpose and its own rules. For many investors, gold is a clear example of an asset assigned to a single account, labelled war insurance. The label is a story, not a property of the metal. Gold prices respond to real yields, the U.S. dollar and central bank demand, and on Monday the first two moved against it.
The flow data shows how many investors adopted that account at once. Global gold-backed ETFs took in US$17.1 billion in August, and U.S.-listed gold funds recorded US$7.9 billion, their strongest month since September 2025, according to State Street Investment Management citing World Gold Council data. That money arrived as prices climbed from below US$4,100 at the July close toward US$4,650 to US$4,700 during August. Buying that follows a rally is consistent with recency bias, and buying under a single-purpose label makes the eventual disappointment sharper.
Loss Aversion Measures the Damage From the Purchase Price
Daniel Kahneman and Amos Tversky, publishing in 1979, showed that people judge outcomes as gains and losses from a reference point rather than as final wealth. Tversky and Kahneman, refining the theory in 1992, estimated that losses weigh about 2.25 times as heavily as equal gains. For an August buyer the reference point is the entry price. Gold futures closed at US$4,529.90 on August 28, so the Monday settle of US$4,168.40 leaves that position down 8.0%. Spot gold near US$4,150 sits about 26% below the January record of US$5,608.35 cited by Trading Economics.
Gold futures lost 8.0% between the August 28 close and Monday, and the US$152.80 drop on September 28 was the largest one-day dollar decline in the 21-session series, arriving twelve days after a Federal Reserve hike that the metal had shrugged off.
The series uses daily closes on weekday sessions only, and the September 28 value is the December contract settle. The Federal Reserve raised its target range to 3.75% to 4.00% on September 16.
Diminishing sensitivity, the companion finding in the 1979 paper, means the first few percentage points below the purchase price register more sharply than the next few.
The Reference Point Is Also a Trap in the Other Direction
Loss aversion does not only produce selling. The same reference point produces the break-even instinct, the wish to hold until the price returns to the entry level and the loss can be erased on paper. Terrance Odean, in a 1998 study of individual brokerage accounts in the Journal of Finance, found that investors realized 14.8% of their paper gains but only 9.8% of their paper losses, the pattern Hersh Shefrin and Meir Statman had named the disposition effect in 1985. Gold buyers face both errors this week: capitulation at the low, or a refusal to reassess a position whose original rationale no longer describes what drives the price.
Shlomo Benartzi and Richard Thaler added a further mechanism in 1995 with myopic loss aversion: the more often investors evaluate a position, the more losses they perceive and the more risk averse they become. This week supplies two evaluation events, the Wednesday PCE inflation report and the Friday nonfarm payrolls report, which Trading Economics flagged as the next inputs to Federal Reserve policy.
Narrow Framing Hides How Much of the Canadian Move Is One Event
The S&P/TSX Composite fell 311.03 points, or 0.87%, to 35,489.86 on Monday, its lowest close since July, with materials, telecoms and financials leading the decline and decliners outnumbering advancers 686 to 294 on the Toronto Stock Exchange, according to Investing.com. In Canadian dollars, gold settled near C$5,844, down 3.76% on the day and below both its 50-day average of C$6,240.69 and its 200-day average of C$6,259.48, according to Gold Stock Canada.
Narrow framing, the tendency Daniel Kahneman and Dan Lovallo documented in 1993 to evaluate each decision in isolation rather than as part of a whole portfolio, makes a 0.87% index decline and a 3.76% gold decline read as two separate events. They are one event with one cause: a rate repricing that lifted the dollar and yields. The Bank of Canada held at 2.25% on September 2 for a seventh straight decision and flagged that upside risks to inflation have increased, and its next decision arrives on October 28, the same day the Federal Reserve is priced to move. The behavioural test for the next 48 hours is whether investors revise the safe-haven label or defend it.