Allocation determines most long-term outcomes by setting your risk envelope before security selection.
Asset allocation is the decision of how to distribute exposure across risk sources: equities, bonds, cash, and other diversifiers. It answers: what risks are you choosing to take, and in what proportions?
Asset Allocation FAQs
For most investors, yes. Allocation sets the portfolio risk envelope and often explains more outcome variance than individual picks. Stock selection matters, but allocation determines how much risk you are taking overall.
When your goals, horizon, or risk tolerance changes, or when drift becomes meaningful. Most investors use a threshold-based or calendar-based rebalancing policy to maintain discipline.
Choosing a target allocation that is too aggressive to hold through drawdowns, then abandoning it at the worst time. A good allocation is one you can stick with.