Risk & Diversification: Building a Diversified Portfolio

Asset classes at a glance

An asset class is a broad category of investment that tends to behave similarly. The main ones are: stocks (ownership in companies, higher growth potential and higher volatility), bonds (lending money for steady interest, lower volatility and lower expected return), cash (safe and liquid, but loses purchasing power to inflation over time), and real estate (property or REITs, a middle ground with its own return and risk profile).

A well-built portfolio usually blends multiple asset classes, because they don't all move in the same direction at the same time — when stocks fall, bonds often hold up better, which smooths out the overall ride.

Age and risk tolerance

A common guiding principle: the more time you have before you need the money, the more short-term volatility you can afford to ride out, because you have time to recover from a downturn. This is why younger investors are often encouraged toward a higher percentage of stocks, while those nearing retirement often shift toward more bonds and cash — money they'll need soon shouldn't be exposed to a market downturn right before they need it.

This isn't a rigid rule — personal risk tolerance and specific goals matter too — but "more time, more risk capacity" is a reasonable starting framework.

Rebalancing — why and how often

Over time, your original allocation drifts. If stocks perform well, they'll naturally grow to become a bigger percentage of your portfolio than you originally intended, quietly increasing your risk without you doing anything. Rebalancing means periodically selling a bit of what's grown and buying more of what hasn't, to bring your allocation back to your target.

Most long-term investors rebalance once or twice a year, or when an allocation drifts by more than a set threshold (like 5 percentage points) — frequent rebalancing isn't necessary and can add unnecessary costs or taxes.

The all-in-one option

Target-date funds and balanced funds do the asset allocation and rebalancing work automatically. A target-date fund (like "2060 Fund") is built for someone planning to retire around that year — it starts more aggressive and automatically shifts toward bonds as that date approaches, without you lifting a finger.

These funds are popular in employer retirement plans precisely because they remove the guesswork — a reasonable default for anyone who doesn't want to manage allocation and rebalancing themselves.

Key terms

Asset allocation

How money is divided among categories like stocks, bonds, and cash.

Asset class

A broad category of investment, like stocks, bonds, cash, or real estate, that tends to behave similarly.

Rebalancing

Periodically adjusting a portfolio back to its original target allocation.

Target-date fund

A fund that automatically adjusts its allocation over time toward a target retirement year.

Risk capacity

How much investment risk someone can afford to take on, based mainly on their time horizon.

Bond

A loan to a company or government that pays back with interest over time.