Inflation is a general rise in prices over time, and it shrinks purchasing power — the quantity of goods and services a fixed amount of money can buy. This matters to anyone holding cash for years or comparing savings interest with rising prices.

Who this matters to

It matters most to anyone holding cash for years, saving toward a long-term goal such as a home deposit, or comparing a savings interest rate against rising prices. If the interest you earn is lower than inflation, the real value of your money falls even while the balance grows.

The two terms, briefly

Inflation is the rate at which overall prices rise, usually published as a yearly percentage. Purchasing power is what a fixed sum can actually buy. The two move opposite to each other: if cumulative prices rise by a certain factor, purchasing power falls by that same factor.

A worked example (illustrative figures)

Assumptions — all hypothetical, not a forecast of Hong Kong inflation:

  • You hold HK$10,000 in cash, earning no interest.
  • Prices rise steadily at 3% per year.
  • The horizon is 10 years.
  • Every price in the example rises at that same rate.

Steps:

  1. Today: HK$10,000 buys one basket of goods.
  2. After 1 year: that basket costs 10,000 × 1.03 = HK$10,300.
  3. After 10 years: the basket costs 10,000 × 1.03^10 ≈ 10,000 × 1.3439 ≈ HK$13,439.
  4. What your HK$10,000 then buys: 10,000 ÷ 1.3439 ≈ HK$7,441 at today's prices.

So after ten years, the same HK$10,000 has about 26% less purchasing power than today, even though the balance never dropped. These are illustrative figures only; actual inflation changes each year and differs by item.

Three common mistakes

  1. "My balance went up, so I'm fine." The correct reading: a balance is a nominal figure — the face number on a statement, not its real buying power. Compare it against prices: with illustrative rates of 2% interest and 3% inflation, the balance grows while real value still falls.
  2. "One inflation number applies to everyone." The correct reading: published inflation is an average across a basket of goods. Your personal basket — rent, food, transport — may rise faster or slower than the average.
  3. "Chasing the highest return fixes it." The correct reading: according to the IFEC, higher expected returns generally come with greater risk, and expected returns are never guaranteed; fees and losses also reduce results. Compare after-fee figures with inflation, not headline rates.

Checklist: what to check next

  • Look up the latest published Hong Kong inflation figure rather than guessing.
  • Compare your savings interest rate against that figure, after any fees.
  • Re-run the example above with your own amount, horizon and rate.
  • To see current savings or time-deposit options side by side, use Jolvex's comparison pages.

Source and disclaimer

Concept source: IFEC — "Five basic investment concepts" (Investor and Financial Education Council), retrieved 2026-10-09, which explains inflation's effect on purchasing power. The hypothetical assumptions were chosen for this article. This article is AI-generated and is general education only; it is not investment or lending advice.