I received a photo of my friend traveling through Lebanon that would not leave my mind. He was holding a bundle of banknotes that looked like it had been taken out of a board game—more than 50,000 Lebanese pounds, the equivalent of about R$ 3.00. It made me realize something we don’t usually think about: while here in Brazil we complain about the dollar, there are countries where the population lives with currencies that have simply lost value.

The Brazilian real closed 2024 as the worst currency in the world among the major ones, with a depreciation of 21.52%. But that’s nothing compared to what you’ll find elsewhere. In 2025, marked by persistent inflation, political crises, and economic instability, some currencies turned into real symbols of fragility. And that led me to think: what really makes a currency become one of the least valuable in the world to the point where it gets to that level?

What’s the recipe for destroying a currency? It’s never an accident. It’s always an explosive mix of factors. Uncontrolled inflation is the first: when prices double every month, people’s savings turn to dust. Then there’s chronic political instability—coup attempts, civil wars, governments changing every year. Without legal security, investors flee, and the currency becomes just colorful paper. Economic sanctions also do their part: when the international community closes the door, the country loses access to the global financial system. Add low international reserves, and you have the perfect formula. If the Central Bank doesn’t have dollars to defend the currency, it plunges. And there’s more: when even the citizens themselves prefer to stash dollars under the mattress instead of trusting the local currency, you know the situation is critical.

Now comes the ranking of the least valuable currencies in the world in 2025. The Lebanese Pound (LBP) is the absolute champion. Officially, it should be 1,507.5 pounds per dollar, but since 2020 that 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, stores accept only dollars, and Uber drivers in Beirut ask for payment in foreign currency. It’s absurd.

Right after that comes the Iranian Rial (IRR). American sanctions turned it into a third-world currency. With R$ 100, you become a millionaire in rials. The government tries to control the exchange rate, but on the street the reality is different. The most interesting part is that young Iranians are migrating to cryptocurrencies—Bitcoin and Ethereum have become a more reliable store of value than the national currency itself.

The Vietnamese Dong (VND) is a different case. Vietnam has a growing economy, but the dong remains historically weak due to monetary policy decisions. You withdraw 1 million dongs from an ATM and receive an amount that looks like TV-series money. Great for tourists, but for Vietnamese people it means imports become expensive.

The Lao Kip (LAK) suffers from a small economy and dependence on imports. At the border with Thailand, merchants prefer to be paid in Thai baht. The Indonesian Rupiah (IDR) has been historically weak since 1998, despite the country being the largest economy in Southeast Asia. Uzbek Som (UZS), Guinean Franc (GNF), Paraguayan Guarani (PYG), Malagasy Ariary (MGA), and Burundian Franc (BIF) round out the ranking—each with its own story of instability, natural resources that are poorly utilized, or economic isolation.

What’s clear is that a less valuable currency in the world isn’t just a financial curiosity. It reflects how policy, trust, and economic stability are interconnected. For anyone thinking about investing, some lessons are obvious: fragile economies present enormous risks. Cheap currencies may seem like an opportunity, but the truth is that these countries are living through deep crises. On the other hand, for tourism and consumption, destinations with devalued currencies can be financially advantageous when you arrive with dollars or euros.

Watching how currencies collapse helps you understand the real effects of inflation, corruption, and instability. Staying alert to these factors is a way to see the importance of trust, stability, and good governance for any economy. Investing is an ongoing process of economic and social learning. One way to ensure the value of your money is to seek assets that cross borders and aren’t subject to local inflation. Want to keep following how money turns into power or fragility around the world? It’s essential to understand not only the least valuable currencies, but also the strongest ones—where opportunities are hidden—and how to prepare to take advantage of them. Investing better is about securing your future.