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Volume 4(8)

Why Do Investors Follow the Crowd? 

Sajeeb Das 

Research Scholar 

Centre for Budget Studies, CUSAT

Imagine opening your phone one morning and noticing that a particular stock is suddenly everywhere. Financial websites discuss it, social media is filled with positive opinions, and people around you talk about buying it. The stock price is rising rapidly. You may not know much about the company, but still feel you should buy it before the price goes higher. But why? Is it because you have carefully studied the company’s financial performance? Or is it because everyone else seems to be buying it?

This situation reflects an important feature of financial markets: people do not always make investment decisions independently. Sometimes, others’ behaviour influences what they buy, sell, and how they perceive the market. When investors see others buying a stock, they may assume those investors have information they lack. As more people buy, the rising price attracts more attention and encourages further buying. A similar process occurs during a market decline. Falling prices create fear, which encourages more investors to sell. What begins as an individual reaction can become a collective movement. 

This behaviour is commonly described as herding—the tendency of individuals to follow others’ actions rather than relying entirely on their own information and analysis. Herding is not always irrational. Following others can provide useful information, especially when investors believe others are better informed. The problem arises when investors follow the crowd without properly evaluating the underlying information or risks. This is especially important when market optimism or pessimism spreads widely. Optimism can fuel expectations of future price increases and make investors more willing to take risks. On the other hand, widespread pessimism can make investors excessively cautious or encourage them to sell quickly. Such collective optimism or pessimism is often referred to as investor sentiment. Investor sentiment can influence how people interpret information. The same piece of economic or corporate news may produce different reactions depending on whether investors are confident or fearful. During periods of strong optimism, positive information may receive greater attention while risks are overlooked. During periods of pessimism, negative information may dominate investors’ decisions. 

The digital age has made this process more complex. Information now travels through social media, online financial communities, news websites, investment apps, and other digital channels at extraordinary speed. Investors are exposed not only to financial information but also to the opinions, expectations, and emotions of thousands of market participants. A popular post, a widely discussed stock, or a sudden wave of negative news can influence investor perceptions quickly. The boundary between information and opinion can become hard to distinguish. This creates a challenge for today’s investors. Having more information does not necessarily mean making better decisions. 

Too much information can make decision-making more difficult. Investors may focus on information that confirms their beliefs, react emotionally to short-term price changes, or feel pressured to act because others seem to be profiting. This is where behavioural finance matters. Traditional financial theories emphasize rational decision-making and the role of information in asset prices. Behavioural finance adds that financial decisions are also influenced by psychology. Investors are human. They can be overconfident after success, fearful during declines, focus too much on recent events, or be influenced by others’ decisions. These tendencies affect individual choices and, when shared widely, can influence market outcomes. 

For an individual investor, recognising these tendencies is valuable. Before buying a stock just because it is popular, ask: “Would I still buy this stock if nobody else were talking about it?” This simple question encourages investors to distinguish between independent analysis and crowd influence. This issue is especially relevant in India, where financial market participation has expanded and investing is more accessible through digital platforms. The growing number of retail investors, combined with the rapid spread of financial information via digital media, has created a market where opinions and expectations spread quickly. 

Understanding these behavioural patterns is important not only for individual investors but also for researchers, financial institutions, regulators, and policymakers. If investor sentiment and collective behaviour influence stock prices, returns, trading activity, volatility, or market liquidity, understanding these factors helps explain how financial markets function. The key question is not whether investors should ignore the crowd. Markets are social environments, and other investors’ actions provide information. The real challenge is recognising when following the crowd is based on useful information and when it is driven mainly by emotion, excitement, or fear. 

Financial markets are often represented through numbers—stock prices, returns, trading volumes, indices, and charts. But behind every number are people making decisions. Those decisions are shaped not only by financial information but also by expectations, emotions, perceptions, and interactions with others. Perhaps, then, understanding the stock market requires us to look beyond the market itself. To understand how markets move, we must also understand how people think, feel, and behave.