The Hormuz Whipsaw: Why Investors Keep Selling the Rally and Buying the Fear

The Strait of Hormuz has now opened and closed three times since the U.S.-Israel campaign began in late February. Each cycle follows the same arc: a relief rally of 1% to 2%, a reversal of similar or greater magnitude when hostilities resume, and a market that ends up roughly where it started. The TSX closed at approximately 34,346 on Friday after recovering all of its war losses. By Tuesday close it had given back 551 points. That is not volatility in the traditional sense. That is a market being yanked repeatedly by the same rope, and investors who respond each time are paying for information the price already contains.

The Availability Cascade in Practice

Behavioral economists use the term “availability cascade” to describe a self-reinforcing cycle in which a vivid, emotionally salient risk becomes overweighted in decision-making simply because it keeps appearing in the news. The Strait of Hormuz is a textbook case. The underlying base rate, that Iran will ultimately need to export its own oil and cannot sustain an indefinite blockade without economic collapse, has not changed materially since February 28. What has changed is the number of times investors have seen the word “blockade” in a headline.

Research from Kahneman and Tversky established that people judge the probability of an event by how easily they can recall a similar event, not by its actual frequency. After three cycles of open-then-close in eight weeks, the closure scenario is extremely easy to recall. It feels like the base case even though it remains the tail risk. This cognitive shortcut is particularly powerful in markets because it operates at the same time investors are watching their account balances move in real time, which amplifies emotional engagement and impairs the kind of slow, deliberate thinking that sound portfolio decisions require.

What the Whipsaw Costs in Real Terms

The cost of reacting to each Hormuz cycle is not just psychological. It is arithmetic. An investor who sold during the initial crisis in early March, rebought after the March 23 ceasefire optimism, sold again when the blockade resumed, then bought into Friday’s rally, and sold again Tuesday has executed four trades in eight weeks in a tax-bearing account. Each round trip generates a taxable event in a non-registered account, and the spreads and timing imprecision mean the investor would need the market to move materially in their favour just to break even versus doing nothing. The research on retail investor timing is unambiguous: individual investors consistently buy near peaks and sell near troughs, systematically underperforming the index they are attempting to navigate.

The specific feature of this crisis that amplifies this pattern is its cyclical, repeated structure. A single acute shock, such as a one-day market drop, typically causes a spike in anxiety followed by adaptation. Repeated shocks at irregular intervals, which describes the Hormuz open-close cycle precisely, produce hypervigilance. Investors do not adapt; they remain in a state of elevated alert. Every new headline resets the anxiety clock. From a behavioral standpoint, this environment is among the most difficult to navigate without a predefined decision framework, because the brain’s threat-detection system is continuously activated and cannot rest long enough for rational analysis to override it.

The Framework Conversation

The most useful thing an advisor can offer in a repeated-shock environment is not more information about the Strait of Hormuz. Clients are saturated with information. What they lack is a decision framework: a set of criteria that determines when a market event is relevant to their specific portfolio and when it is not. A client with a 15-year investment horizon and a balanced 60/40 allocation does not have a Hormuz problem. They have a behaviour problem disguised as a Hormuz problem. Naming that distinction clearly is the most protective intervention available.