Why invest at all? Saving, inflation and time

Ana, 28, has €5,000 in a savings account paying 1% a year. Her uncle says, “Never touch the stock market.” A colleague says, “Invest everything.” Both sound sure of themselves. Who is closer to right?

Saving and investing do different jobs

Saving keeps money safe and easy to reach. Investing means buying things such as shares or bonds that are expected to grow, and accepting that their value can fall for a while. The expected reward for that risk is a higher return: the gain on your money, as a percentage.

A simple order works for many people: first an emergency fund and any expensive debt, then goals with a date, then long-term investing. Money you will need soon belongs in safe savings.

Inflation quietly shrinks idle money

Prices usually rise. When your account pays less than prices rise, your money buys less each year, even though the balance grows. The return after inflation is the real return:

real return = (1 + nominal return) ÷ (1 + inflation) − 1

Time is the strongest ingredient

Returns earn returns on top of themselves. Because of this, the number of years matters more than most people expect.

Long-run data points the same way. In a large study of US markets from 1900 to 2025, shares gained about 6.6% a year after inflation, bonds about 1.6% and cash about 0.5%. But the path was bumpy: between 1928 and 2025, the S&P 500 lost money in 26 of 98 calendar years. Past results are no guarantee of future ones.

Which money should not be invested

The time horizon is how long until you need the money. A long horizon gives markets time to recover from falls. A short one does not. Money for next year’s rent, tuition in 18 months or a car deposit in 10 months should stay in safe savings.