Investing basics: the stock market, risk and reward

The main building blocks

A stock is a small share of ownership in a company. A bond is a loan to a government or company that pays interest. A fund - such as a mutual fund or exchange-traded fund (ETF) - pools money from many investors to hold many stocks or bonds at once. Index funds aim to track a market index rather than pick winners.

How the stock market works

Stock exchanges are marketplaces where buyers and sellers trade shares. Prices move every day based on company results, interest rates, the economy and investor sentiment. Over short periods those moves can be large and unpredictable; markets have also experienced long declines. Past performance does not guarantee future results.

Risk and reward are linked

Assets that can grow more usually swing more. Cash in savings is stable but may lose purchasing power to inflation. Bonds tend to move less than stocks. Stocks have historically offered higher long-term potential with much larger ups and downs. You can lose money investing, including the money you put in.

• Diversification spreads money across many investments so one failure hurts less.
• Time horizon matters: money needed within a few years is usually kept out of volatile assets.
• Fees reduce returns every year, so low-cost funds keep more of your growth.
• Risk tolerance is both financial (can you afford a drop?) and emotional (will you panic-sell?).

Before you invest

Investing usually makes most sense after you have an emergency fund and a plan for high-interest debt. Retirement accounts and tax rules differ by country; if you are unsure, a qualified, fee-only financial professional can help you match investments to your goals.

Asset allocation is the mix; diversification is the spread

Asset allocation means deciding how much of your money belongs in broad categories such as stocks, bonds and cash. Diversification means spreading exposure within and across those categories. Owning several funds does not automatically create diversification: they may hold many of the same companies or focus on the same industry.

Match the mix to the goal, the time until you need the money and your ability to absorb losses. Money for a near-term deposit has a different job from retirement savings decades away. Bonds also carry risks, including issuer default and price changes when interest rates move; cash can lose purchasing power. No single mix is right for everyone.

Regular investing is a habit, not a guarantee

Dollar-cost averaging means investing a fixed amount on a regular schedule. The same contribution buys more units when prices are lower and fewer when they are higher. It can make a plan easier to follow without guessing next week's price, but it does not guarantee a profit or protect against a prolonged decline.

If you already have a lump sum, spreading it out also keeps part of it out of the market for a while, which can miss gains when prices rise. Compare the trade-offs rather than assuming one approach is always better. Review the plan when goals or circumstances change, not simply because a headline is alarming.

Read the costs and avoid pressure to act

Look for ongoing fund expenses, trading charges, account fees and any adviser fees. Understand what the investment owns, how you can sell it and what could go wrong. A promise of high guaranteed returns with little risk, pressure to act immediately or a request to send money to an unfamiliar recipient is a warning sign. Verify the provider through the relevant regulator before investing.