How to Avoid the 2 Biggest Investment Mistakes? Beginners Tips!

How to Avoid the 2 Biggest Investment Mistakes? Beginners Tips!

Here, we highlight the 2 most prominent investment mistakes that have been identified as common among individual or retail investors, who buy and sell securities, mutual funds and ETFs through a brokerage firm or savings account (like 401(k)s). The investment mistakes are formed by underlying behavioral biases. We give tips on how to avoid the multiple underlying behavioral biases.

In particular, we look at diversification (over asset classes, location and portfolio formation) and shortsightedness (leading to present bias, regret aversion and the disposition effect).


The First Biggest Investment Mistake: Diversification
Novice investors make three big mistakes when building an investment portfolio
How to avoid this biggest investment mistake?
The Second Biggest Investment Mistake: Shortsightedness
How to avoid this biggest investment mistake?

The First Biggest Investment Mistake: Diversification


If one were to pick a single phrase to characterize the design of the financial products on the markets it might be “pro choice”. As an individual investor you are confronted with a choice between an overwhelming, almost frighting, number of choices that you have to make for an investment. First, you must choose an asset class, for example: securities, fixed income, commodities or real estate. Then, you must choose to form your portfolio either by holding individual assets, or by buying a mutual fund or ETF. Finally, you must consider the types of risk: market or systematic risk, exchange rates, inflation rate, political risk, and interest rates.

Novice investors make three big mistakes when building an investment portfolio

Researchers (Cronqvist and Thaler, 2004) have shown that individual or retail investors make poor choices when creating an investment portfolio for the long term.[1]  Firstly, their research shows that retail investors choose to hold too much equity (local and global) in their portfolio: on average 96% (!) of their wealth.  Only 4% holds fixed-income securities investments (i.e., inflation-indexed bonds), and almost no investor considers private equity or hedge fund investments.

In your portfolio, also consider: real estate, commodities, corporate bonds and don’t forget to index against inflation

Too many local shares


Secondly, the researchers show that things are even worse, because 50% of the invested wealth is locally concentrated. So, only invested in the country you live in. For example, if you live in Japan, then you only hold Japanese stocks. Thus, roughly speaking, 50% of the investors is prone to the home bias. Home biases is one of the most frequent investing biases.

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Too passive management of the investment portfolio

Thirdly, investors show signs of inertia or limited attention spans. The researchers find that investments of retail investors are influenced by recent returns in various segments of the market when forming their portfolio. After the portfolio has been formed, the majority of investors does not alter their portfolio anymore.

Importantly, you should also diversify your portfolio globally to avoid the “home bias”

They simply do not check frequently enough whether their holdings are still accurate and, thus, display inertia. The attention of investors is limited, since retail investors are most strongly influenced by past historical returns at the moment of creating their portfolio.

This implies that the moment of forming your portfolio has strong implications for your asset allocation holdings, because after you have formed your portfolio you stick with it.

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How to avoid this biggest investment mistake?

You should diversify your portfolio well over all the existing asset classes. A good rule-of-thumb is to hold 60% of your invested wealth in risky assets (such as stocks) and 40% of your invested wealth in more risk-free assets (such as government bonds). Personally, I opt for 100% investing in stocks, ETFs, real estate and other risky investments. But note that this is very personal, and I may have a (much) higher risk profile than you.

Of course, also consider in your portfolio: real estate, commodities, corporate bonds and do not forget to index against inflation. The latter is especially important when you invest for the long run.

Importantly, diversify your portfolio also globally to avoid the home bias. You do not want to have too much local (geographical) concentration in your portfolio. Nowadays, financial markets easily help you overcome the home bias, because you can buy mutual funds and ETFs which hold small pieces of assets over the whole world. If you choose to create your portfolio by holding individual assets, then do not forget to buy non-local assets as well (i.e., consider emerging markets).

People tend to give the present more weight than the future.

For long-term investors, inertia can be troublesome. It is wise to check your portfolio occasionally, just to make sure your portfolio holdings still represent your risk-return preferences. If not, then change your portfolio based on the information you have today, but don’t let the media fool you otherwise you are prone to limited attention and you will become shortsighted.

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The Second Biggest Investment Mistake: Shortsightedness


Humans have the tendency to give a stronger weight to the present than the future. Consequently, investors display this behavior in their investments. Actually, the inertia or limited attention of investors is one of the consequences of shortsighted behavior. Shortsightedness is borne by present bias: you favor a payoff today over a payoff in the future. Also, you favor a potential loss in the future over a certain loss today.

Every investor has at least encountered this once: you were confident that a certain stock had very little downside potential. However, the stock price starts to decrease. Still, you feel like your investment decision was right, so you didn’t sell the stock for a small loss. You hold on to the stock, because a loss is only a loss when you sell the position (i.e., investors think differently about paper losses and realized losses). Yet, the stock continues to decrease in price, and you eventually sell at a larger loss.

On the other hand, every investor probably also encountered at least once the following: you are confident in holding a certain stock with good upside potential. As soon as the stock price starts to rise, you sell the investment to ensure yourself of a gain. Afterwards, it turns out that holding on to the longer would have resulted in higher returns.

Researchers call the above two situations the disposition effect.

Investors tend to hold on to losing investment too long in the hope that the stock mean reverts. On the other hand, investors tend to sell winning investment too soon to lock in returns. Both effects are borne by present bias and, even worse, lead to regret: in both situations you could have chosen differently to make your outcome more favorable.

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How to avoid this biggest investment mistake?

For long-term investors present bias is certainly something that should be avoided. As a long-term investor you want to focus on the future rather than the present, however our instincts exactly tell us to do the opposite.

To avoid present bias, regret aversion and the disposition effect all at once set trading rules ex-ante that never change and stick to these trading rules. Using such long-term plans is also exactly how large institutional investors, such as pension funds, operate.

For example, if you lose XX% on an investment, exit the position. If the stock price rises above a pre-specified certain level, then lock in your gains. These rules should be unbreakable such that you never trade on emotion. Thus, even when markets go down, you have a sophisticated plan that you’ve thought well about so that you stick to it.


Cronqvist, Henrik, and Richard H. Thaler. 2004. “Design Choices in Privatized Social-Security Systems: Learning from the Swedish Experience.” American Economic Review, 94 (2): 424-428.

[1] Specifically, the research of Cronqvist and Thaler (2004) focusses on individual investment choices for retirement in Sweden.

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