I received a message from a friend traveling through Lebanon last week. In the photo, he was holding an absurd bundle of banknotes—it looked like Monopoly money. More than 50,000 Lebanese pounds. Do you know how much that is in reais? About 3 reais. That made me think a lot about how we complain about the dollar here while there are countries with the most devalued currency on the planet.

The real closed 2024 as the worst currency among the major ones, devaluing 21%, but that’s nothing compared to what you’re going to see out there. There are places where people wake up and watch their currency melt in their hands. In 2025 and 2026, with persistent inflation, political crises, and economic instability, some currencies became real symbols of fragility.

But why does this happen? A weak currency is never an accident. It’s always an explosive combination: hyperinflation that doubles prices every month, chronic political instability, economic sanctions that isolate the country, international reserves at rock bottom, and citizens keeping dollars under the mattress because they no longer trust the local currency. When you see this happening, you know the economy is truly collapsing.

The countries with the most devalued currency in the world today make a very interesting ranking to follow. The Lebanese pound leads easily—officially it would be 1.507,5 per dollar, but in reality you need more than 90,000. Banks limit withdrawals, and stores only accept dollars. A journalist told me that in Beirut even Uber drivers ask for payment in dollars.

Next comes the Iranian rial, which American sanctions turned into a third-world currency. With 100 reais, you become a millionaire in rials. The funny thing is that young Iranians migrated to cryptocurrencies because Bitcoin and Ethereum have become a more reliable store of value than the national currency itself.

The Vietnamese dong is a different case. Vietnam is growing economically, but the currency remains historically weak due to monetary policy. You withdraw 1 million dongs from an ATM and receive a bundle worthy of a Netflix series. Great for tourists, but for Vietnamese people it means expensive imports and limited purchasing power.

Then we have the Laotian kip, the Indonesian rupiah, the Uzbek som, the Guinean franc, the Paraguayan guarani, the Malagasy ariary, and the Burundian franc rounding out the top 10. Each of these countries with the most devalued currency has its own story of economic collapse, political instability, or dependence on imports.

What becomes clear when you follow all of this is that a weak currency reflects a weak economy. For us Brazilians, a few lessons make sense: first, fragile economies involve enormous risks even if they look like opportunities; second, destinations with devalued currencies can be financially advantageous for tourism; third, all of this is practical lessons in macroeconomics.

Seeing currencies plummet helps you understand the real effects of inflation, corruption, and instability on people’s lives. It’s a reminder that trust, stability, and good governance are not luxuries—they are the foundation of any economy. Investing better means securing the future, and part of that is understanding what happens when all of this disappears in a country.