Asset Allocation

Just as nobody can predict tomorrow's weather perfectly, nobody can promise what financial markets will do next. Guessing whether stock prices will crash tomorrow or interest rates will spike is nearly impossible, even for top experts.

So what happens if you put all your money into the stock of a single company? If that company hits an unexpected crisis, your entire nest egg takes a big loss in an instant. But if you split your money across assets with very different personalities, then when one side loses, the other side can hold firm.

For example, when the economy weakens and stock prices fall, the price of safe-haven assets like Treasury bonds (bonds issued by the government) often rises instead. Mixing assets that react in different ways like this is the starting point of asset allocation, a technique for lowering investment risk effectively.

When people start investing, they usually worry first about questions like "Which stock will take off?" or "When should I buy and sell?" But according to a number of financial studies, most of the ups and downs in a portfolio's returns over time come not from which individual stocks you bought, but from how you split your money across asset classes.

An asset class is a group of assets with its own distinct character, such as stocks, bonds, commodities (gold, crude oil, and so on), real estate, and cash. Buying shares in many different companies is stock diversification, which spreads money within one asset class. Asset allocation spreads money between asset classes that are different in nature, like stocks and bonds. Both count as diversification in the broad sense, but they work at different levels.

These assets often move differently depending on the economic cycle. In a boom, company profits grow and stocks gain strength. In a recession or financial crisis, safe assets like bonds or the U.S. dollar tend to gain value. However, when prices and interest rates both surge, stocks and bonds can fall together, so asset allocation can't wipe out losses completely. Still, the key is to build a balanced portfolio that won't fall apart in any kind of weather.

Say you start with a perfect 50/50 split between stocks and bonds. Over time, that balance naturally drifts. If the stock market rallies hard, stocks can swell to 70% or even 80% of your total portfolio.

If you leave it that way, a stock market crash will hurt far more than you originally planned for. So at regular intervals, you sell some of the stocks that have grown too large to lock in gains, and buy more of the bonds that have shrunk, bringing everything back to the original 50/50.

This process is called rebalancing (resetting your asset weights). It makes you trim what has risen and top up what has lagged, following a rule you set in advance rather than your emotions. Keep in mind that rebalancing doesn't guarantee higher returns, and buying and selling can come with costs.