Since entering 2026, I’ve noticed that discussions about the economy have changed. It’s no longer about high prices, but rather about falling prices. This is what’s called "deflation," and it’s actually more dangerous than most think.

What exactly is deflation? It’s not just a temporary drop in prices of goods, but a continuous decline in the overall price level, measured by a negative Consumer Price Index (CPI). Many think, "Lower prices are good," but in reality, it’s a sign that people lack purchasing power, are afraid to spend money, and if left unchecked, it can lead to a recession.

It’s important to distinguish between disinflation and deflation. For example, if inflation slows from 5% to 2%, prices are still rising but at a slower rate. But deflation is a true decrease in prices, such as -1% or -2%. In this case, your money gains value.

History warns us a lot. During the Great Depression (1929-1939), prices in the U.S. fell by 27%, stock markets crashed, banks failed, and the money supply contracted by 30%. The result was 25% unemployment. Even more alarming is Japan’s case since 1990. Japan has entered a "Lost Decade" that has lasted over 30 years. Land and stock prices plummeted due to bursting bubbles, companies shifted to debt repayment instead of investment. Japanese people are accustomed to falling prices, which has led to delayed spending. Discount stores grew massively, and wages stagnated—an example of persistent deflation.

There are two causes of deflation. On the demand side, when people are afraid, they save instead of spend. Confidence drops, banks tighten lending, creating a "liquidity trap." Even with low interest rates, people don’t borrow because they expect prices to fall further. On the supply side, technological advances like AI and robots reduce production costs. Globalization floods the market with Chinese goods, and energy prices decline. All these factors push prices downward.

For Thailand in 2026, specific factors include a GDP growth of only 1.5-1.6%, the lowest in three decades. An aging society is accelerating, with fewer elderly consumers. Household debt is high at 85% of GDP, constraining spending. All these signals point to severe deflation.

What are the impacts of deflation? It creates a vicious cycle. When people expect prices to fall, they delay purchases. Sales decline, businesses cut prices and lay off workers. Unemployed people have less money to spend, so sales drop further. It keeps spiraling. The worst part is "debt is the devil." In deflation, a debt of 1 million baht becomes increasingly burdensome because income decreases while debt remains unchanged. Stock market profits shrink, stock prices plummet, and real estate prices fall due to declining confidence.

So, what’s a good investment? During deflation, "cash is king," not "cash is trash" as in inflationary times. Government bonds, especially long-term ones, benefit when central banks cut interest rates, causing bond prices to rise. The real return increases as prices fall. Defensive stocks—such as essential goods, consumer services, and healthcare—are good options. Gold remains an attractive safe-haven asset.

But here’s the key: those who truly benefit from deflation are those who understand it and adapt quickly. Those holding enough cash, investing in bonds and gold, or willing to trade against the market trend. Others holding cyclical stocks and with high debt will be at a severe disadvantage.

2026 is the year to wake up. Deflation is no longer a distant threat; it’s a factor that will determine whether your portfolio survives or collapses. Those who adapt will not only survive but also profit while others panic.