Yesterday I received a photo from a friend who’s traveling through Lebanon. In the picture, he was holding a giant bundle of banknotes that looked like Monopoly money. More than 50,000 Lebanese pounds—equivalent to about 3 reais. It made me think: while here in Brazil we complain about the dollar, there are countries where people have had to live with currencies that have simply melted away over time. And when you start researching which country has the most devalued currency in the world, you find that the situation is even worse than you imagine.

The real closed 2024 as the worst currency among the major ones, with a devaluation of 21.52%. But that’s nothing compared to what you’ll see if you look outside Brazil. In 2025, a global scenario marked by persistent inflation, political crises, and economic instability turned some currencies into symbols of economic fragility. The question is: why do some currencies lose so much value?

When you follow the financial market for a few years, you realize that a weak currency is never an accident. It’s always the result of an explosive combination of factors. Uncontrolled inflation is the first. In Brazil, we get nervous about 7% a year. Now imagine countries where prices double every month. That’s hyperinflation. It literally devours savings and wages.

Then there’s chronic political instability—coups, civil wars, governments that change every year. When there is no legal certainty, investors flee and the currency turns into colorful paper. Economic sanctions also destroy. When the international community closes its doors to a country, it loses access to the global financial system. And without enough international reserves, the central bank can’t defend the currency. It plummets.

Capital flight completes the picture. When even the citizens themselves prefer to keep dollars under the mattress instead of using the local currency, you know the situation is critical. Put all of that together, and the world’s most devalued currency reflects an economy that has been completely weakened.

The Lebanese pound is the clear absolute champion. Officially, it should be 1,507.5 pounds per dollar, but since the 2020 crisis, that rate doesn’t exist in the real world. In the parallel market, you need more than 90,000 pounds to buy 1 dollar. Banks limit withdrawals, and stores only accept dollars. Uber drivers in Beirut ask for payment in dollars because nobody wants Lebanese pounds.

The Iranian rial comes right after. Sanctions have turned the currency into paper. With 100 reais, you become a millionaire in rials. The government tries to control the exchange rate, but the reality on the streets is different. There are multiple parallel exchange rates. What’s most interesting is that young Iranians are migrating to cryptocurrencies. Bitcoin and Ethereum have become a more reliable store of value than the national currency itself. For many people, investing in cryptocurrencies has become the solution to preserve and increase their capital.

The Vietnamese dong is a different case. Vietnam has a growing economy, but the dong remains historically weak due to monetary policy. You withdraw 1 million dongs from an ATM and you get an amount that’s straight out of a police drama. It’s great for tourists, but for Vietnamese people it means imports get expensive.

Then there’s the Laotian kip, which is so weak that at the border with Thailand, merchants prefer to accept Thai baht. The Indonesian rupiah has also never managed to strengthen, despite Indonesia being the largest economy in Southeast Asia. The Uzbek som reflects decades of a closed economy. The Guinean franc is a classic case of a resource-rich country with a weak currency due to political instability. The Paraguayan guarani is traditionally weak. For us Brazilians, that keeps Ciudad del Este as a shopping paradise. The Malagasy ariary reflects that Madagascar is one of the poorest countries in the world. And the Burundian franc closes the ranking as a currency so weak that for big purchases, people carry bags of money.

For the Brazilian investor, some lessons become clear. Fragile economies offer enormous risks. Cheap currencies may look like an opportunity, but the truth is that these countries live through deep crises. On the other hand, destinations with devalued currencies can be financially advantageous for people arriving with dollars or euros. And watching currencies crash helps you understand the real effects of inflation, corruption, and instability.

The ranking of the world’s most devalued currencies isn’t just a financial curiosity. It’s a clear reflection of how politics, trust, and economic stability are interconnected. Paying attention to these factors is a way to understand the importance of good governance for any economy—and for your future as an investor. One way to ensure the value of your money is to invest safely in assets that cross borders and aren’t subject to local inflation. Investing better means securing your future.