What Is Inflation and Why It Matters

🟢 Why Your Money Needs to Grow

Prices go up over time. A meal that costs ฿60 today will likely cost ฿89 in 20 years. Your rent, your groceries, your healthcare — they all tend to rise, year after year. Sometimes slowly. Sometimes quickly.

This gradual increase in prices is called inflation. And while it may not be dramatic in every year, over a long enough period, it changes what your money can buy — and what your savings are really worth.

How Inflation Works

Inflation means the general price level of goods and services rises over time. When prices rise, each unit of currency buys less than it did before. This is called a loss of purchasing power.

How much prices rise varies significantly. Some countries experience 4–5% or more per year. Others, including Thailand in recent years, have seen very low official inflation — averaging around 1% over the last decade, with some years even slightly negative.

However, the official inflation number is an average across all goods and services. Your personal experience may be different. Rent in major cities, healthcare, education, and imported goods often rise faster than the headline number. The food at a street vendor may not change much, but the cost of a hospital visit or a university degree can increase significantly.

What Inflation Does to Your Money

Even at a moderate rate, inflation compounds over time. Here is what happens to ฿100,000 in purchasing power at 2% annual inflation — a realistic long-term assumption:

Today:       ฿100,000
In 5 years:  ฿90,573   (you lost ฿9,427 in buying power)
In 10 years: ฿82,035   (you lost ฿17,965)
In 15 years: ฿74,301   (you lost ฿25,699)
In 20 years: ฿67,297   (you lost ฿32,703)
In 25 years: ฿60,953   (you lost ฿39,047)

At 2%, you do not lose half your purchasing power overnight. But over 25 years, nearly 40% of your money’s value quietly disappears. And these numbers assume inflation stays at 2% — a spike like 2022 (6%) can accelerate the erosion dramatically.

The Real Problem: Your Savings Are Standing Still

Most savings accounts pay between 0.5% and 2.0% interest per year. When inflation runs at a similar rate, your savings are not growing — they are standing still. The number on your account goes up, but what you can buy with it barely changes.

Here is what happens to ฿500,000 in a savings account earning 1.5% per year, with inflation at 2%:

                  Bank balance     Real purchasing power
After 5 years:    ฿538,642        ฿487,865
After 10 years:   ฿580,270        ฿476,024
After 20 years:   ฿673,428        ฿453,197

After 20 years, your bank shows ฿673,428 — that feels like progress. But in terms of what that money can actually buy, you have ฿453,197 in real purchasing power. You lost ฿46,803 — not because anything went wrong, but because your savings grew slower than prices.

Your money is not losing value fast. But it is not growing either. It is standing still while everything else moves forward.

Why This Matters for Investing

The reason investing matters is not just to “make more money” — it is to make sure your money keeps up with reality. When your returns exceed inflation, your purchasing power genuinely increases. When they do not, you are falling behind — even if your account balance looks bigger.

Savings account at 1.5%, inflation at 2%:
Real return = -0.5% per year (slowly falling behind)

Invested at 6%, inflation at 2%:
Real return = +4% per year (genuinely growing)

Here is what happens to ฿500,000 invested at 6% annual return, adjusted for 2% inflation:

                  Portfolio value   Real purchasing power
After 10 years:   ฿895,424         ฿734,559
After 20 years:   ฿1,603,568       ฿1,079,155

After 20 years, your real purchasing power has more than doubled — from ฿500,000 to ฿1,079,155 in today’s terms. Meanwhile, the savings account barely held its ground.

The difference is not about inflation being scary. It is about the gap between standing still and moving forward. Over 20 years, that gap is ฿625,958 in real purchasing power — from the same starting amount.

What You Can Do

Keep your emergency fund in savings — that is fine. Your emergency fund (3–6 months of expenses) should stay liquid and accessible. At low inflation, the cost of keeping it in a savings account is small. That is a reasonable trade-off for safety.

Invest your long-term money. Money you will not need for 5 years or more has the time to grow. Even a conservative portfolio has historically outpaced inflation over long periods. The longer your time horizon, the more the gap between saving and investing widens.

Watch for spikes. Inflation may be low on average, but individual years can be very different. 2022 saw 6% inflation — and in those years, savings accounts lose real value fast. A diversified investment portfolio provides a buffer against unexpected inflation spikes.

Remember that averages hide variation. Official inflation may be 1-2%, but if your rent rises 5% per year and your healthcare costs increase 8%, your personal inflation rate is higher. Think about what you actually spend money on, not just the headline number.

Key Takeaways

Inflation is the gradual increase in prices that reduces what your money can buy
Official inflation has been low in recent years (~1% average), but personal inflation (rent, healthcare, education) is often higher
At 2% annual inflation, you lose nearly 40% of your purchasing power in 25 years
Savings accounts at 1.5% interest barely keep up — your money stands still while prices move forward
Investing at returns above inflation is the way to genuinely grow your purchasing power
The difference between saving and investing over 20 years is more than ฿625,000 in real purchasing power
Your emergency fund stays in savings — your long-term money should be invested

Frequently Asked Questions

Is inflation really a concern if it is only 1-2%?

Even at low rates, inflation compounds over decades. At 2%, you lose a third of your purchasing power in 20 years. More importantly, the comparison that matters is not “how much am I losing?” — it is “how much am I not gaining?” The opportunity cost of not investing is far larger than the inflation loss itself.

What causes inflation?

Many factors contribute — increased demand for goods and services, rising production costs, expanding money supply, and global economic conditions. Central banks manage inflation through interest rate policy. Sudden events (energy crises, pandemics) can cause temporary spikes or drops.

Can inflation go negative?

Yes — this is called deflation, and it has happened in recent years. Deflation means prices fall, which sounds good for consumers but can signal economic weakness and discourage spending and investment. Central banks generally try to avoid prolonged deflation.

Does inflation affect investments too?

Yes. Inflation affects the real return of every investment. A portfolio returning 8% in a year with 2% inflation has a real return of approximately 6%. When evaluating investment performance, always consider whether returns are quoted in nominal (before inflation) or real (after inflation) terms.