Behavioral Biases in Investing: A Common-Sense Look at How Headlines Can Affect Decisions

Investors have had a lot to digest lately. Recent interest rate and market headlines have raised familiar questions: What comes next for the economy? How might this affect my portfolio? And should I be doing anything differently?

That reaction is understandable. But moments like this are also a good reminder that investment decisions are not made with spreadsheets alone. They are also influenced by emotion, headlines, recent experiences, and the desire to feel in control. Behavioral finance is the study of those patterns. The goal is not to eliminate emotions completely, but to recognize when they may be pushing us toward a decision that does not actually fit our long-term plan.

In this article, we’ll look at several common investing biases and simple ways to recognize them in real time. Catching these patterns early can be the difference between a thoughtful decision and an emotional one.

Recency Bias: Giving Too Much Weight to What Just Happened

Recency bias means we tend to overreact to the most recent news. If the market sells off after a Federal Reserve (Fed) announcement, it can feel like more trouble must be coming. If the market rallies a few days later, it can feel like the concern has passed. In both cases, the latest move may feel more important than it really is.

A single Fed decision or one strong trading day is just one piece of information. The more useful question is: did this news actually change the long-term plan, or did it simply change how the situation feels today? Most of the time, a short-term headline should not drive a major long-term decision.

Loss Aversion: Why Losses Feel So Much Worse Than Gains

Loss aversion is the tendency to feel the pain of losses more strongly than the pleasure of gains. In practical terms, a temporary decline in a portfolio often feels more urgent than an equally sized gain feels rewarding. That can create a strong desire to “do something” when markets are uncomfortable.

The problem is that acting quickly to avoid short-term discomfort can sometimes create a bigger long-term problem. Selling after a decline may feel safer in the moment, but it can lock in losses and make it harder to participate when markets recover. Sometimes the most disciplined response is not action, but patience.

Anchoring: Getting Stuck on an Old Number or Assumption

Anchoring happens when we get attached to a specific number or expectation. It could be a portfolio’s prior high value, the price paid for an investment, or an assumption about where interest rates “should” be. Once that number is in our minds, we may judge everything against it, even if conditions have changed.

For example, if investors expected rate cuts and instead got a rate hike, they may be slow to update their thinking. The key is to ask whether the old reference point still makes sense. If it no longer reflects the current environment, it should not be driving today’s decisions.

Herd Behavior: Following the Crowd Instead of the Plan

Market-moving news can make it feel like everyone else is reacting immediately. That can create pressure to buy because others are buying, or sell because others are selling. But a financial plan should be based on personal goals, time horizon, cash-flow needs, and risk tolerance—not on what the crowd appears to be doing on a volatile day.

Short-term trading and long-term investing are not the same thing. A rally may reflect relief, momentum, or short covering. A selloff may reflect fear or forced selling. Neither one, by itself, is a complete signal about the long-term value of a diversified plan.

Confirmation Bias: Looking for Evidence That Supports What We Already Believe

Confirmation bias means we naturally look for information that supports what we already think. If someone was already worried about inflation, a rate hike may feel like proof they were right. If someone was already optimistic, they may focus on commentary that says the hike is not a big deal.

The better approach is to intentionally look for the other side of the argument. What information could prove the current view wrong? What might the market already be pricing in? What matters to the actual financial plan? Asking those questions helps separate evidence from emotion.

Overconfidence: Mistaking a Good Outcome for a Good Prediction

Overconfidence – which can also be masked as a form of greed – can be just as dangerous as fear. When markets recover or portfolios perform well, it is tempting to assume the outcome happened because we made the right call. Sometimes that may be true. Other times, a diversified strategy simply did what it was supposed to do.

Time Period Bias: Time Frames Shape Conclusions

Time period bias occurs when conclusions are drawn from data limited to a specific time frame that is not representative of longer-term trends, potentially leading to misleading results. Marketing departments are experienced at selecting time periods to fit an investment strategy narrative or sales pitch. While time periods are disclosed in investment profile and fact sheets, the performance statistics always have time period bias because a time period must be selected for reporting. This is one of several reasons for a common investment reporting disclosure – “Past performance is not indicative of future results”.

The Common Thread

The common thread is simple: headlines can make short-term events feel more important than they are. They can make fear feel like caution, confidence feel like insight, and activity feel like control. But investing success usually has less to do with reacting quickly and more to do with staying aligned with a thoughtful plan.

This does not mean interest-rate decisions or market moves should be ignored. They matter. But they should be put in context. A rate change does not automatically mean an investor should sell. A rally does not automatically mean an investor should chase performance. The right question is whether anything has changed about the investor’s goals, time horizon, cash needs, risk tolerance, or overall plan.

The investors who tend to fare best over time are usually not the ones who predict every interest-rate decision or market swing correctly. They are the ones who build a plan that can handle uncertainty and then have the discipline to follow it. Headlines will keep coming. Markets will keep reacting. The advantage comes from noticing the emotional pull of those moments, pausing before acting, and returning to the plan before making a decision.

At JMG, we work with clients to build financial plans around their lives. These plans account for uncertainty, volatility, and the less-than-ideal events that life inevitably brings. If this article resonates with you, I invite you to reach out to your JMG advisor to discuss it in more detail. Feel free to share it with others who may also find it useful.

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