If you invest in a wide range of stocks of a wide range of companies, the risk becomes bigger. What’s the ideal number of various shares in a portfolio? The best number of assets in a portfolio is an individual issue for each case. But there can be some landmarks. Economists Edwin J. Elton and Martin J. Gruber, in their “Modern Portfolio Theory and Investment Analysis”, write that by increasing the number of stocks in a portfolio, you can significantly reduce specific risks.
Having a portfolio which includes shares of roughly 20 different companies almost eliminates unsystematic risks. Thus, the portfolio risk with one share is 49.2%, and with 20 shares — about 20%. Additional stocks (21-1000 items) do not reduce risk as much. The optimal number of shares is around 20-30 pieces for each portfolio.
The so-called “lazy portfolios” are easy to maintain. They are mainly composed of exchange-traded funds – ETFs, containing dozens of companies.
Benefits of Diversification
Regardless of investment goals, diversification provides several benefits.
- Specific risk elimination. You can decide between particular countries and segments, selecting those groups of assets that have the potential to grow or serve as an anti-inflationary hedge.
- Reduced volatility. Investors seek to reduce portfolio volatility so as not to suffer from severe capital drawdowns and relax.
- Optimal portfolio. Your perfect portfolio composition depends on your goals, the holding period and risk tolerance. But the very fact of broad diversification and including weakly correlated assets significantly reduces the portfolio risk.
Weaknesses of Diversification
- Lack of growth. The main diversification goal is to reduce investment risk while not sacrificing much profitability. If the investor’s purpose is to earn the maximum profit at any cost, regardless of the risk exposure, then he should concentrate on the riskiest assets. Because the higher the risk, the higher the potential return. At the same time, the capital distribution over many assets is a more conservative approach that does not promise extraordinary returns.
- Diversification can’t work perfectly in a falling market. Correlations between instruments tend to increase during periods of market stress. Why? During the market crash, investors massively dump a wide range of assets and sell risk assets like crypto. Investors turn to cash as the most reliable asset during times of uncertainty.
Diversification, goals, and risk
When choosing an investment strategy, start by setting your financial goals and determining your risk tolerance. You simply select a portfolio with an acceptable risk profile. One of the main rules when choosing a strategy is the shorter the investment period, the greater the share to allocate to conservative instruments.
Remember that diversification allows you to offset your portfolio volatility even if it contains high-risk assets. The most important thing is to include a wide variety of uncorrelated assets.
- Not all countries and sectors prosper simultaneously. A lot depends on the current phase of the economic cycle. Distributing capital across different segments and markets could provide a capital return in any specific case.
- Correlation between instruments may change over time. It generally increases in a falling market during periods of high volatility, and diversification may work out badly in moments like this. Diversification does not always meet the investors’ expectations.
Look at what is happening in the stock market at a particular moment and expect that stock market valuations will tend to touch their average values. Correlation is a dynamic indicator calculated over a specific period. The problem is that correlations change over time. And what worked effectively in the past may not work in the future.
It is worth keeping an eye on the assets’ weight so that none of them takes up too much of a portfolio. Otherwise, the risks associated with it will prevail. Generally, the advice is to allocate no more than 5% of capital to one asset.
Markets have become more volatile in recent decades. The correlation between different asset classes is increasing every decade. It has become more complicated to diversify in modern market realities.
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