What you will learn
- Define asset allocation and asset classes
- Understand why allocation drives most of a portfolio's long-term results
- Distinguish strategic from tactical allocation
- Match an allocation to time horizon and risk tolerance
The theory is behind us, and now the practical side begins. Research suggests that one decision matters more than almost any other in investing, more than which stocks you pick or when you buy them. That decision is asset allocation: how you divide your portfolio among broad categories of investments. This lesson and the ones after it are about building and protecting a real portfolio.
What is asset allocation? (Fidelity Investments)
A clear introduction to dividing a portfolio among stocks, bonds, and cash. Focus on how the mix shapes risk and return.
What asset allocation is
Asset allocation is the decision of how to split your money across asset classes, the broad categories of investment such as stocks, bonds, cash, and sometimes real estate or commodities. Each class has its own risk and return profile and reacts differently to the economy, so the mix you choose largely sets the risk and return of the whole portfolio. This is a higher-level decision than picking individual securities, since it is about the proportions given to entire categories.
Key terms
- Asset class
- A broad category of investment with shared characteristics, such as stocks, bonds, or cash.
- Strategic asset allocation
- The long-term target mix set by your goals, horizon, and risk tolerance, and held over time.
- Tactical asset allocation
- Shorter-term, deliberate deviations from the target to exploit perceived opportunities.
- Glide path
- A plan that gradually shifts the mix toward safer assets as a goal like retirement approaches.
Why it matters so much
A famous finding in finance is that asset allocation explains the large majority of the variation in a portfolio's returns over time, far more than which individual securities you pick or how you time the market. The intuition is simple: choosing to hold 70 percent stocks rather than 30 percent has an enormous effect on both risk and return, dwarfing the effect of exactly which stocks fill that slice. This is why serious investors settle their allocation before fussing over individual picks.
The return of a 60/40 portfolio
A classic allocation is 60 percent stocks and 40 percent bonds. If stocks are expected to return 8 percent and bonds 3 percent, what is the portfolio's expected return?
- Weight each class. Stocks: 0.6 times 8 percent is 4.8 percent. Bonds: 0.4 times 3 percent is 1.2 percent.
- Add them. 4.8 percent plus 1.2 percent.
- Read the result. The expected return is 6 percent.
Why it matters: Just like any portfolio, the return is a weighted average of the classes. And because stocks and bonds often have low correlation, the mix is usually less volatile than stocks alone, which is the diversification payoff of allocating across classes.
Compute an allocation's return
A 70/30 portfolio holds 70 percent stocks (expected 9 percent) and 30 percent bonds (expected 4 percent). What is its expected return, in percent?
Strategic versus tactical
- Strategic asset allocation is the long-term target mix, set by your goals, risk tolerance, and horizon, and maintained over time. It is the disciplined backbone of a portfolio.
- Tactical asset allocation makes shorter-term, deliberate moves away from the target to chase perceived opportunities. It is more active and much harder to do well, since it amounts to market timing, which is notoriously difficult.
Tactical vs strategic asset allocation (Money Evolution)
Contrasts the steady long-term target with shorter-term tactical shifts. Watch for why tactical moves are risky.
The key inputs: horizon and risk tolerance
The right allocation depends above all on time horizon and risk tolerance. A longer horizon lets you hold a bigger share of volatile, higher-returning assets like stocks, because there is more time to recover from downturns before you need the money. As the horizon shortens, shifting toward stable assets like bonds guards against a downturn striking right before you need the funds. This is the logic behind holding more stocks when young and gradually adding bonds near retirement, a path called a glide path.
How you divide a portfolio among asset classes shapes its fate more than which individual securities you pick. Allocation is the decision that matters most.
Who should hold more stocks?
A 25-year-old saving for retirement in 40 years and a 68-year-old who needs the money for living expenses next year both ask about their stock allocation. Who can sensibly hold more in stocks?
The 25-year-old has a 40-year horizon and time to recover from downturns, so a heavier stock allocation makes sense. The retiree needs the money next year and should hold far more in stable assets.Why allocation dominates
In your own words, explain why the choice of asset allocation tends to matter more for long-term results than the choice of individual securities.
Write an answer before comparing it with the model response.
Model answer
The split among asset classes determines the overall risk and return character of the portfolio, and that dwarfs the effect of which specific securities fill each slice. Whether I hold 70 percent stocks or 30 percent stocks changes my expected return and volatility enormously, while swapping one large-cap stock for another barely moves the needle because they behave similarly. Different asset classes also have low correlation with each other, so the allocation decision is where most of the diversification and most of the return variation come from. Individual picks operate within the box that allocation has already drawn.
Once you choose an allocation, it will not stay put. As assets rise and fall at different rates, the mix drifts away from your target and quietly changes your risk. The next lesson is about pulling it back: rebalancing.