Investing Basics · definition
Asset Allocation
Asset allocation is the way a portfolio is divided across asset classes such as stocks, bonds and cash. It describes the mix, not which individual investments to pick.
Asset allocation is the composition of a portfolio across broad asset classes: stocks, bonds, cash, and sometimes real estate or commodities. Where diversification spreads risk within and across holdings, asset allocation describes the high-level recipe itself, for example 60% equities and 40% bonds.
Key takeaways
- Asset allocation is the percentage split of a portfolio across asset classes.
- Research has repeatedly found that the asset mix explains a large share of a portfolio's return variability over time.
- Allocations are described along a spectrum from defensive (more bonds and cash) to aggressive (more equities).
- Rebalancing is the practice of restoring the original mix after markets move it.
Why the mix matters
Each asset class behaves differently. Equities historically delivered higher long-run returns with larger swings, bonds delivered steadier income with lower volatility, and cash held its nominal value while losing purchasing power to inflation. The proportions in which a portfolio combines them therefore set its overall character. A widely cited study by Brinson, Hood and Beebower (1986) found that asset allocation policy explained more than 90% of the variability of returns of large pension funds over time, a finding that is often quoted, sometimes overstated, and still debated in its details.
Common descriptive models
Financial literature describes recurring templates: the classic 60/40 portfolio (60% equities, 40% bonds), age-based rules of thumb in which the bond share grows as someone approaches retirement, and target-date funds that shift the mix automatically along a "glide path". These are descriptions of common practice, not recommendations. Which allocation fits a specific person depends on goals, horizon and risk tolerance, and that judgement belongs with a licensed adviser, not an encyclopedia.
Rebalancing
Market movements change the mix: after a strong equity year, a 60/40 portfolio may drift to 70/30. Rebalancing sells what grew and buys what shrank to restore the target weights. It is described as a discipline for keeping risk constant rather than a return-enhancing trick, and it can have tax and cost consequences that vary by account and country.
Frequently asked questions
Is asset allocation the same as diversification?
No. Allocation is the split across asset classes; diversification is spreading risk in general, including within a class. A portfolio can be allocated across classes yet poorly diversified within them.
What is a 60/40 portfolio?
Shorthand for 60% equities and 40% bonds, the most cited balanced template in finance writing. Its popularity makes it a common benchmark in research and commentary.
Sources
This entry is for education only. Investing Value describes how financial concepts work; it does not provide investment, tax or legal advice, and nothing here is a recommendation to buy or sell any asset.