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Asset Allocation

Asset allocation is the strategy of dividing an investment portfolio among different asset classes, such as stocks, bonds, and cash, to balance risk and return according to goals and time horizon.

What Is Asset Allocation?

Asset allocation is the process of deciding how to split money across broad categories of investments, known as asset classes. The most common classes are stocks, bonds, and cash or cash equivalents, though some investors also include real estate, commodities, or other holdings. The goal is to build a mix that matches the investor's objectives, how much risk they can tolerate, and how long they plan to invest before needing the money.

How It Works

Different asset classes tend to behave differently. Stocks have historically offered higher long-term growth but with larger short-term swings in value. Bonds generally provide more predictable income and tend to fluctuate less, though they carry their own risks, such as interest rate risk. Cash is the most stable in nominal terms but usually loses purchasing power to inflation over time. Because these classes often respond differently to the same economic events, combining them can smooth out the overall ride for a portfolio.

Asset allocation is commonly expressed as percentages. For example, a portfolio might hold 60% in stocks, 35% in bonds, and 5% in cash. Investors who value growth and have a long horizon may hold a larger share of stocks, while those nearing a financial goal often shift toward bonds and cash.

Why It Matters

Research on portfolio construction has long suggested that the mix of asset classes explains much of the variation in a portfolio's returns over time, more than the choice of individual securities. Asset allocation also determines how a portfolio may behave in a downturn. A mix that feels comfortable during rising markets can be tested during sharp declines, which is why many investors review their allocation periodically.

Maintaining an Allocation

Over time, market movements can push a portfolio away from its target. If stocks rise faster than bonds, the stock share may grow larger than intended. Rebalancing is the practice of selling some of the overgrown holdings and buying the underweight ones to restore the original mix. Rebalancing keeps risk in line with the plan, though it may involve tax consequences and transaction costs depending on the account type and jurisdiction.

Updated October 15, 2026. For general education only; not financial, tax or legal advice.

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Related Terms

Stock

A stock is a unit of ownership in a company, giving the holder a proportional claim on the firm's assets and earnings, and usually some voting rights.

Bond

A bond is a loan that an investor makes to a borrower, such as a government or company, in exchange for regular interest payments and the return of the principal at a set maturity date.

Interest Rate Risk

Interest rate risk is the chance that changes in market interest rates will reduce the value of an investment, most often bonds and other fixed-income securities.

Inflation

Inflation is the sustained rise in the general price level of goods and services over time, which reduces how much money can buy.

Diversification

Diversification is an investing approach that spreads money across different assets, sectors, or regions so that a poor result from one holding has a smaller effect on the whole portfolio.

Rebalancing

Rebalancing is the process of buying and selling holdings in a portfolio to restore its original target mix of assets after market movements have shifted the proportions.

Risk Tolerance

Risk tolerance is the degree of investment loss or volatility an investor is willing and able to accept in pursuit of potential returns.

Modern Portfolio Theory (MPT)

Modern Portfolio Theory is an investment framework, introduced by Harry Markowitz in 1952, that shows how diversifying holdings can manage risk and maximize expected return for a given level of risk.