Five Weeks In: What the Iran War Is Doing to Investor Psychology

The behavioral finance literature on geopolitical shocks focuses heavily on the acute phase: the initial selloff, the panic headlines, the impulsive calls to move to cash. That phase ended roughly three weeks ago. What is happening now in investor psychology is subtler and in some ways more dangerous: a chronic low-grade anxiety that has normalized sustained uncertainty and eroded the disciplined conviction that good long-term investing requires.

Five weeks is long enough for a crisis to stop feeling like a crisis and start feeling like weather — an unpleasant but apparently permanent background condition. That shift in emotional framing is precisely when behavioral errors tend to compound. The investor who did not panic-sell in week one may still make a poor decision in week five, not from fear but from fatigue.

The Three Behavioral Patterns of Week Five

The first pattern is habituation to bad news. Repeated exposure to alarming headlines — oil above $100, tankers struck, ceasefire talks collapsing — gradually reduces the emotional response to each new piece of negative information. This sounds like resilience but often is not. Habituated investors stop reacting to signals that should still be informing their thinking. The mid-April supply cliff that energy analysts have identified — when strategic reserves and Russian oil exemptions run out simultaneously — is not priced into most retail investor thinking because five weeks of oil news has numbed the signal.

The second pattern is what behavioral researchers call the false floor. After a sustained drawdown, investors unconsciously treat the current level as the new baseline and begin to feel that further declines are unlikely simply because so much decline has already occurred. This cognitive error — sometimes called the gambler’s fallacy applied to markets — has no empirical support. Goldman Sachs strategists have noted that if the Strait of Hormuz remains closed through the summer, an additional 5-7% S&P 500 decline is plausible. The fact that the index is already down 9% from its peak does not make further decline less likely.

The third pattern, most visible today, is FOMO on recovery. Bloomberg noted that by late March the S&P 500 was on track for its worst month and quarter since 2022, and that small-lot retail investor buying conviction — a reliable dip-buying signal in prior corrections — had faded materially. That fading conviction means that when a genuine positive catalyst arrives, the emotional response is disproportionate: investors who sat through five weeks of bad news overcorrect toward optimism on the first credible peace signal. This morning’s futures surge on ceasefire rumours is partially a reflection of that accumulated emotional pressure releasing.

What the Quarter-End Statement Does to Investor Psychology

There is a well-documented phenomenon in behavioral finance where the same loss feels meaningfully worse when expressed as a dollar figure than as a percentage. A client who has watched their portfolio decline 9% over five weeks has processed that information gradually and may have adapted emotionally. The same client receiving a quarterly statement showing a $47,000 decline on a $520,000 portfolio is receiving a different kind of information — a single, concrete, irrefutable number that the brain processes as a loss event rather than a process. Statements arriving this week will trigger this effect across a broad population of investors simultaneously.

The academic research on this is consistent: investors are significantly more likely to make portfolio changes in the weeks following a quarterly statement than during the interim period, even when the underlying market information is identical. Advisors who proactively reach out before clients open their statements — framing the number in context before the emotional response sets in — consistently see better outcomes than those who respond reactively after the call.

The Historical Case Against Acting Now

Dave Ramsey’s widely circulated advice during this period to “turn off the television” and hold course is behaviorally sound even if it is not analytically sophisticated. Morgan Stanley Managing Director Daniel Hunt made the same point with more precision: selling into a falling market ensures losses are locked in, and the investors most harmed by crises are those who exit during the drawdown and miss the subsequent recovery. The historical record on geopolitical shocks is consistent: markets have absorbed the 1973 oil embargo, the Gulf War, the 9/11 attacks, the 2022 Ukraine invasion, and the June 2025 Israel-Iran conflict. Each produced a brief but painful drawdown followed by recovery. The investors who fared worst were not those who held through the worst days — they were those who sold at the bottom and waited too long to re-enter.

The relevant behavioral question for today is not whether to act on this morning’s ceasefire signal. It is whether the five-week fatigue cycle has eroded the disciplined framework that was in place when the war began, and whether the emotional pressure of a quarterly statement arriving this week is enough to push investors toward a decision they will regret in Q3.