Investment Norms Can Shape Your Next Move

• Common investment rules can lead to sub-optimal financial choices
• Herd mentality and familiarity bias often drive poor decision making
• Investors should use personal goals and risk tolerance over old norms

Investing can feel like navigating a maze of conflicting advice. We often rely on widely accepted 'norms' or rules of thumb as a guide. But while these shortcuts can be helpful, they can also silently steer us toward choices that aren't right for us.

The Unseen Scripts of Investing

From the '100 minus your age' rule for equity allocation to the mantra to 'invest in what you know,' the world of investing is filled with widely accepted guidelines. These norms act as mental shortcuts, simplifying complex decisions. They often emerge from decades of market experience and can provide a sensible starting point for beginners. For instance, the 'Rule of 72' offers a quick way to estimate how long it will take for an investment to double, helping to illustrate the power of compounding. Another common rule suggests investing at least 10% of your income for long-term goals. These scripts provide a sense of order and logic in the often-chaotic world of finance. However, they are not universal laws, and treating them as such can be a significant misstep.

The Psychology of the Herd

One of the most powerful forces shaping investor behaviour is the herd mentality. This is the tendency for individuals to follow the actions of a larger group, often without independent analysis. Psychologically, this is driven by social proof—the assumption that if many people are doing something, it must be the correct thing to do. This bias is amplified by the fear of missing out (FOMO), especially when stories of friends or social media influencers making quick profits go viral. In India, where retail investor participation has surged, herd behaviour is a significant factor, often leading investors to buy assets at peak valuations during market bubbles or to sell in a panic during downturns. While following the crowd can feel safe, it often leads to buying high and selling low—the opposite of a sound investment strategy.

Familiarity and False Comfort

The advice to 'invest in what you know,' popularised by legendary investor Peter Lynch, sounds intuitive and empowering. The logic is that if you understand a company's products or industry, you have an edge in evaluating its potential. This approach can build confidence and encourage deeper engagement with your investments. However, this norm comes with its own set of risks. Familiarity can breed overconfidence and lead to a lack of diversification. For example, an employee might invest heavily in their own company's stock, feeling they have inside knowledge. This concentrates risk: if the company struggles, both their investment and their job could be in jeopardy. True due diligence goes beyond personal familiarity and requires objective research into a company's financial health, competitive landscape, and valuation.

When Rules of Thumb Fail

The '100 minus your age' rule is a classic example of a simple norm that is becoming increasingly outdated. It suggests you subtract your age from 100 to determine the percentage of your portfolio that should be in equities. The idea is to reduce risk as you get older. However, with people living and working longer, this formula can be overly conservative, potentially leaving retirees with insufficient growth to outpace inflation over a 30-year retirement. Many advisors now suggest using 110 or even 120 as the baseline to allow for a higher equity allocation. This highlights a crucial point: investment norms don't account for individual circumstances. They ignore personal risk tolerance, specific financial goals, and the prevailing economic environment, such as current interest rates and inflation.

Forging Your Own Path

Moving beyond norms doesn't mean ignoring all conventional wisdom. It means using it as a starting point for building a strategy that is uniquely yours. The first step is to define your personal financial goals and their time horizons. Are you saving for a down payment in five years or for retirement in thirty? Answering this will dictate the level of risk you can afford to take. Next, assess your own risk tolerance honestly. Market downturns are inevitable; knowing how you'll react emotionally can prevent panic-selling. Finally, prioritize diversification. Spreading your investments across different asset classes, industries, and geographies is a time-tested way to manage risk. Instead of blindly following a rule, let your required rate of return for a specific goal guide your asset allocation.