Intro to Behavioral Finance

Introduction to Behavioral Finance

Ever wonder why the stock market swings wildly, even without a clear reason? 

Traditional finance assumes people always make logical decisions when it comes to money. 

But in the real world, we make mistakes, follow our emotions, and often act irrationally. 

Behavioral finance is a field that mixes psychology with finance to understand how people really behave when making financial decisions. 

This lesson will show you how our feelings and habits influence markets in ways that numbers alone can’t explain.

Where Behavioral Finance Came From

Behavioral finance began in the 1970s, when two psychologists, Daniel Kahneman and Amos Tversky, studied how people make decisions. 

They found that people don’t always think logically—especially when faced with uncertainty. 

Later, economist Richard Thaler used these ideas to explain strange behavior in the financial world. 

Traditional finance assumes people always make the smartest choice – like robots. 

But behavioral finance reminds us we’re human—emotional, forgetful, imperfect humans.

How Psychology Affects Money Decisions

Psychology plays a big role in how people invest. Most of us aren’t cool, calm, and collected when making money decisions. 

We often rely on first impressions, get nervous when we hear bad news, or look for information that supports what we already believe. 

Instead of being perfectly rational, we follow the crowd, get caught up in hype, and regret decisions after the fact.

A good example is that, during the dot-com bubble of the late 1990s, many people invested in tech stocks simply because “everyone else was doing it”. 

These behaviors affect not just individuals, but also the market as a whole.

Why We Use Shortcuts to Make Decisions

Our brains can only handle so much information at once. 

To save time and energy, we often take mental shortcuts—called heuristics. 

These shortcuts help us decide quickly, but they can cause mistakes. 

For example, we might think a new company will do well just because it reminds us of another company we liked. 

Or we might believe something is likely just because we heard about it recently. 

These shortcuts often lead to biased thinking, which can affect stock prices and investment trends.