Stay alert. 2026 is not about the inflation we are facing, but a new silent threat called 'deflation,' which could unexpectedly break your portfolio. If you don't understand what it is, let's take a look.

Deflation is a situation where the prices of goods and services decrease continuously in the economy. It's not just a temporary dip, but a broad decline reflecting problems in overall supply and demand. Many think 'cheaper goods are good,' but in macroeconomics, deflation is a warning sign that people lack purchasing power or are hesitant to spend money. If left unchecked for too long, it could lead to an economic recession.

I see many people confuse 'slowing inflation' with 'deflation.' They are different. Slowing inflation means prices are still rising but at a slower pace, such as rising from 5% to 2%. Deflation, on the other hand, means prices are actually falling, like -1% or -2%, which means the real purchasing power of money is increasing. But that could be bad for the economy.

Looking at history, the Great Depression of 1929-1933 is the most brutal example. Prices in the U.S. fell by 27%, stock markets collapsed, banks failed, the money supply contracted by 30%. The result was a halt in consumption, chain bankruptcies, 25% unemployment—an vicious cycle that’s hard to fix.

Or Japan, which entered a prolonged deflationary period for over 30 years after the bubble burst in 1990. Land and stock prices plummeted, banks suffered losses, Japanese companies focused more on debt repayment than investment. The Japanese became accustomed to falling prices, leading to delayed spending, stagnant wages—that’s long-term deflation.

Thailand in 2026 is showing multiple warning signs. GDP is projected to grow only 1.5-1.6%, the lowest in 30 years. An aging society is increasing rapidly. This group consumes less. Household debt exceeds 85% of GDP, dragging down consumption. All these are signs of quiet deflation.

The impact of deflation is a vicious cycle. When people believe prices will fall further, they delay purchases. Sales decline, businesses lower prices and production, layoffs and wage cuts follow, unemployment rises, sales drop again—an unstoppable cycle.

Worst of all, debt becomes a demon. The real value of debt increases. If you owe 1 million baht but your income drops by 3%, your debt burden becomes much heavier. You need to work harder or sell more to pay off the same debt. Stock markets are also pressured—company profits decline, stock prices fall, real estate prices drop, rents decrease, and bad debts increase.

In a deflationary environment, the era of 'cash is trash' is over. Now, 'cash is king.' You need to focus on preserving capital and generating steady cash flow.

Government bonds are the strongest fortress. When central banks cut interest rates, long-term bond prices rise. In deflation, the real return on bonds becomes even higher. Holding cash or money market funds is good—you preserve your principal and keep ammunition ready to buy good assets at low prices when the crisis ends.

For stock investments, avoid cyclical stocks and shift to defensive stocks, such as essential goods (people need to eat and use), utilities (electricity, water), healthcare (illnesses don’t discriminate by economy). Gold also serves as a safe asset, especially when people distrust the banking system.

For brave investors who trade against the market, deflation is suitable for short selling. When the stock market is bearish, you can open short positions to profit from falling prices or speculate on bonds and gold when you expect interest rates to decrease and prices to rise.

2026 is a test for those prepared and understanding that deflation is no longer a distant issue. It’s a factor that will determine your financial fate. Adjusting your portfolio to hold bonds, accumulating gold, or employing short trading strategies are ways to not only survive but also profit while others panic.