Risk Diversification

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What is Risk Diversification?

Risk diversification is an investment strategy that aims to reduce the overall risk of a portfolio by investing across a variety of different asset types, industries, geographies, and asset classes.


The basic principle behind diversification is that different investments will react differently to the same market events or economic conditions.

By holding a diverse mix of investments that have low or negative correlations to each other, potential losses in one area can be offset by gains in another segment of the portfolio. This helps to smooth out the portfolio’s overall returns and mitigate its volatility.

Techopedia Explains the Risk Diversification Meaning

Techopedia Explains the Risk Diversification Meaning

At its core, risk diversification simply means not putting all the eggs in one basket when it comes to investments. It refers to spreading out the available investment capital across different types of securities, sectors, countries/regions, asset classes, etc, to minimize the unsystematic or specific risk associated with a single investment within the portfolio.

The underlying idea is that investors can reduce their exposure to any particular risk factor or idiosyncratic event by holding a diversified mix of investments. While diversification won’t necessarily protect against systematic market-wide risks that affect all investments similarly, it allows investors to limit their vulnerability to risks related to an individual company, sector, asset class, or geography.

What are the Risks Associated with Investing?

Before discussing how diversification can help mitigate risks, it’s important to understand the various risks that investors face when they expose their money to different types of financial assets. All investments carry some degree of risk, including the possibility of a complete loss of principal in some cases.

Some of the main risks associated with investing include:

Market Risk
Investments may fluctuate in value due to movements in the overall financial markets, affecting all asset classes to varying degrees.

Interest Rate Risk
Changes in interest rates can lead to either an increase or decline in the value of interest-bearing securities such as bonds.

Inflation Risk
The potential loss of purchasing power and real returns from an investment over time due to inflation.
Liquidity Risk
Due to insufficient market depth or disruptions, it may be difficult to convert investments to cash without reducing their price.
Credit/Default Risk
There’s a risk that a bond issuer or counterparty may fail to make interest payments or repay the principal on the agreed-upon date.
Political/Regulatory Risk
Government policy changes, geopolitical events, or regulatory updates may have adverse effects on investments.
Currency Risk
Fluctuations in foreign currency can negatively impact the value of international investments.

While diversification alone cannot completely eliminate all the risks involved when investing, it does allow investors to mitigate certain unsystematic risks related to specific companies, sectors, or geographic regions. In particular, diversification helps reduce risks that are unrelated to broader market movements.

How Does Diversification Help Reduce Risk in Investing?

Diversification helps reduce risk primarily by combining investments with varying degrees of correlation to each other. Correlation is a statistical measure of how investments perform relative to each other.

The value of this metric typically ranges from -1 to +1. Two investments with a correlation closer to +1 tend to move in the same direction, while those closer to -1 exhibit move in the opposite direction to each other.

By investing in assets with low or negative correlation, losses in one investment could be potentially offset by gains in another, at least theoretically. An investor holding only a single stock is exposed to experiencing a complete loss of principal if that company goes bankrupt. However, by holding 20 or more stocks across different industries and geographies, that same investor can reduce the portfolio’s company-specific risks.

This diversification effect permits more consistent performance over time rather than exposing investors to the extreme peaks and valleys of any single security. While a diversified portfolio will still be exposed to the systematic market risks that affect all investments, its performance will exhibit lower overall volatility and a smoother return profile.

What is the Relationship Between Risk and Return?

To further understand the meaning of risk diversification, there is a foundational principle in investing that states that to generate higher potential returns, an investor must assume higher risks. This risk/return tradeoff or ratio helps guide asset allocation decisions for both individual investors and professional portfolio managers.

In general, asset classes like stocks are considered riskier investments due to their historically higher volatility levels and a greater chance of short-term fluctuations or declines.

However, over long periods, this higher risk has been compensated with higher expected returns. Lower-risk investments like government bonds or cash have provided more stability but also offer more modest returns over time.

Diversification provides a way for investors to find a risk/return profile aligned with their goals and risk tolerance level. By combining different asset classes with varying risk profiles in one portfolio, they can potentially achieve higher risk-adjusted returns over the long run rather than concentrating solely on either higher or lower-risk assets.

Diversification Across Different Asset Classes

The foundation of most diversification approaches starts with allocating investments across different major asset classes, including:

  • Stocks/Equities
  • Bonds/Fixed Income Securities
  • Real Estate
  • Commodities
  • Cash & Cash Equivalents.
  • Alternative Investments (e.g., hedge funds, private equity, crowdfunding, etc.).

Each of these asset classes has its own unique risk and return characteristics that can enhance diversification within a portfolio. Their prices are driven by different factors and they can exhibit low or negative correlations to each other over time.

For example, stocks represent an ownership interest in companies and tend to be more volatile, with higher potential for capital appreciation but also higher risk.

Bonds are loans that pay a fixed amount. Compared to stocks, they tend to exhibit lower levels of price volatility but also lower expected returns. Holding both stocks and bonds can provide diversification benefits to smooth out an investment portfolio’s volatility.

Diversification in Mutual Funds and ETFs

For many individual investors, achieving adequate diversification directly through individual stock and bond holdings requires a very large investment portfolio. This is where pooled investment vehicles like mutual funds and exchange-traded funds (ETFs) can be extremely useful diversification tools.

A single mutual fund or ETF may hold hundreds or even thousands of underlying securities, providing exposure to an entire asset class, sector, geography, or investment style in one transaction.

Investors can build a diversified portfolio by combining a handful of these funds across different asset classes rather than trying to invest in hundreds of individual securities.

For example, an investor may hold a total U.S. stock market index fund, an international stock fund, a U.S. bond fund, and a real estate investment trust (REIT) fund. This relatively simple four-fund portfolio provides instant diversification across domestic and international stocks, bonds, and real estate.

Other Diversification Strategies

Other Diversification Strategies

Beyond asset class diversification, investors and portfolio managers can also implement diversification through other methods, including the following.

Sector DiversificationGeographic DiversificationSize/Style DiversificationCurrency Diversification

By spreading investments across different economic sectors, such as technology, healthcare, financials, energy, etc., investors reduce the portfolio’s concentration in any one industry and the associated sector-specific volatility.

Investing not just in domestic markets but also internationally across developed and emerging markets globally. This strategy helps mitigate country-specific risks.

It involves combining different styles like growth and value as well as companies of different sizes (large-cap, mid-cap, small-cap). This diversification tactic provides exposure to firms at various stages of maturity.

This one is for globally diversified investors who may benefit from allocating funds across asset classes denominated in different currencies, such as USD, EUR, JPY, etc.

In addition to these strategies, investors can further diversify their portfolios by allocating across:

  • Active vs. passive management styles
  • Public vs. private markets
  • Tangible (real assets) vs. intangible assets
  • Different risk factors (value, momentum, volatility, etc.)

Employing multiple diversification strategies can increase the complexity of building and managing a portfolio and its rebalancing requirements. It could also result in higher transaction costs and potential tax implications for taxable accounts.

However, for investors with longer time horizons and higher risk tolerance, enhanced diversification can improve risk-adjusted returns.

How to Use Risk Diversification Within a Portfolio?

Now that we have a clear definition of risk diversification let’s examine how it works in practice.

For most investors, asset allocation across broad asset classes like stocks, bonds, and cash tends to be the primary driver of portfolio returns and risk over time. This is commonly referred to as strategic asset allocation.

From this strategic starting point, investors can introduce diversification via the other tactics mentioned above, like geographic diversification, factor tilts, etc. These tend to represent relatively smaller allocation “satellites” complementing the core portfolio.

The optimal diversification strategy will depend on an investor’s individual circumstances, including:

  • Investment objectives and time horizon
  • Risk tolerance
  • Tax considerations
  • Liquidity needs
  • Cost and fee sensitivity

Within the constraints of those personal factors, the portfolio can be constructed by using various diversification methods to achieve desired exposures across different investments, sectors, securities, etc.

Diversification strategies are not just employed when the portfolio is being built. They are also analyzed, modified, and rebalanced over time as market movements and changing conditions inevitably cause percentage allocations to drift from their targets.

Risk Diversification Examples

Here are a few examples of how investors may build diversified investment portfolios.

Basic 3-Fund Portfolio

A simple portfolio for a U.S.-based investor could consist of equal-weighted allocations in the following instruments:

  • Total U.S. Stock Market Index Fund
  • Total U.S. Bond Market Index Fund
  • Total International Stock Index Fund

This provides global equity diversification as well as diversification between stocks and bonds.

Diversified Retirement Portfolio

A moderately risk-averse investor who is saving for retirement may opt to build a portfolio similar to this one:

  • 40% – Total U.S. Stock Market
  • 20% – Total International Stock Market
  • 25% – Total U.S. Bond Market
  • 10% – Real Estate Investment Trusts (REITs)
  • 5% – Commodities

This portfolio is diversified across domestic and international stocks, investment-grade bonds, real estate, and commodity exposure via futures or a commodities fund. The allocations provide a balanced risk profile suitable for someone closer to retirement age.

Aggressive Growth Portfolio

A higher risk tolerance investor with a long-term horizon may opt for a more aggressive asset allocation such as:

  • 60% – Total U.S. Stock Market
  • 20% – Total International Stock Market
  • 10% – U.S. Small Cap Stocks
  • 5% – Emerging Markets Stocks
  • 5% – High Yield Bonds

This portfolio skews heavily towards equities, including small-cap and emerging-market stocks, for added return potential. It still maintains some degree of diversification into high-yield bonds as a lower-risk fixed-income component.

The key is designing an asset allocation plan upfront that aligns with the investor’s goals, risk profile, and investment horizon while implementing appropriate diversification strategies.

Risk Diversification Pros and Cons

Like any investing strategy, diversification has both potential benefits and limitations that investors should consider


  • Reduces overall portfolio risk and volatility
  • Can smooth out returns over full market cycles
  • Provides exposure to investments that may perform well in different environments
  • Carries the potential to enhance risk-adjusted returns in the long run


  • Tends to underperform during periods of strong market rallies
  • Requires ongoing monitoring and rebalancing
  • Can increase costs and fees from trading multiple funds/securities
  • Does not protect against systematic risks that affect all investments, like black-swan events or supply shocks

Ultimately, diversification is meant to act as a risk management technique by limiting outsized exposure to any single investment or factor. It helps investors adhere to the prudent principle of not putting all their eggs in one basket.

Risk Diversification Challenges

Risk Diversification Challenges

While the concept of diversification is straightforward, implementing and maintaining an appropriate diversification strategy over time can be challenging.

Asset Allocation
One of the biggest challenges is determining the right asset allocation across different asset classes, sectors, geographies, etc. This decision requires analyzing factors like risk tolerance, time horizon, taxes, and liquidity needs.

As markets move over time, portfolio weights can drift significantly from their target allocations. This introduces additional risks based on the new weightings. Rebalancing by trimming winners and adding to laggards is essential, but it may result in increases in trading costs and taxes.

Excessive Diversification
It’s possible to over-diversify a portfolio to the point where you’ve sacrificed too much potential return in exchange for an incremental reduction in volatility. This can lead to returns that are inferior to a cap-weighted index fund over the long run.
Correlated Returns
In periods of extreme market stress, correlations between asset classes can actually increase, reducing some of the theoretical benefits of diversification. This happened in 2008 when most asset classes declined altogether during the subprime financial crisis.
Fees and Taxes
Achieving robust diversification, especially across more complex asset classes, tends to involve higher management fees and transaction costs that can eat into the portfolio’s net returns. It also creates more taxable events every year for accounts whose earnings are taxable.

The Bottom Line

Risk diversification is a prudent investing strategy but requires careful planning, execution, and maintenance to be effective. For most investors, simply combining different mainstream asset classes like stocks, bonds, and cash is a good starting point to achieve healthy levels of diversification.

More sophisticated investors can then dive deeper into other diversification methods if appropriate for their individual situation.

The key is finding the right balance between an acceptable risk level and a decent expected return based on quantitative analysis and qualitative factors like personal risk tolerance and time horizon.

There is no single optimal asset allocation or diversification strategy that works for everyone. However, if embraced prudently, diversification can help reduce portfolio volatility and keep investors on track toward their long-term financial goals.


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Alejandro Arrieche Rosas
Financial Reporter
Alejandro Arrieche Rosas
Financial Reporter

Alejandro has seven years of experience writing content for the financial industry and more than 17 years of combined work experience, serving under different roles in multiple business fields, including tech and financial services. Before joining Techopedia, Alejandro collaborated with numerous online publications such as Seeking Alpha, The Modest Wallet, Capital.com, Business2Community, EconomyWatch.com, and others, covering finance, business news, trading platform reviews, and educational articles for investors. Alejandro earned a Bachelor's in Business Administration from UNITEC, Venezuela, and a Master's in Corporate Finance from EUDE Business School, Spain. His favorite topics to cover are value investing and financial analysis.