Investment risk: start with the goal and the spending date

Before comparing investments, define what the money must do. Money for a near-term payment faces a different problem from money intended for a goal many years away. A return figure alone cannot tell you whether an investment suits that job.

Write down the goal in concrete terms

Name the purpose, the amount required and the date when you expect to spend it. Also note whether that date is flexible. “Save for a home deposit in three years” is more useful than “grow my money,” because it creates a deadline against which risk can be judged.

Ask what would happen if the investment fell in value just before the payment. Could you delay the goal, use another resource or reduce the amount? If the answer is no, that limitation deserves attention before the investment is chosen.

Separate willingness from ability to take a loss

You may feel comfortable seeing a market price fall, yet still need the money to pay a bill. Equally, someone with substantial reserves may dislike uncertainty. Risk tolerance involves both the ability and the willingness to bear losses. A plan should address the practical consequence as well as the emotional response.

Look at the whole portfolio

Diversification spreads exposure across investments. Check the underlying holdings: several funds can still own many of the same companies or concentrate on one industry. Counting products is not the same as understanding what drives their returns.

Diversification can reduce concentration risk. It does not guarantee a profit or prevent losses when markets fall. Currency exposure, fees and access conditions also deserve attention when comparing options.

Use a decision record

Before committing money, write a short record of the goal, spending date, main risks, costs and evidence supporting your choice. Add the circumstances that would prompt a review. This makes it easier to distinguish a change in your needs from a reaction to yesterday’s price movement.

Our fictional case studies practise this reasoning without prescribing a product. Start with The Original Case Studies for a broad introduction, or explore The Nobel Economics Connection for the economic ideas behind portfolio choice and behaviour.

Further reading: Investor.gov: Asset Allocation and Diversification, for explanations of time horizon, risk tolerance and diversification.