1. Iranian Rial

The Iranian Rial is the least valued currency in the world. It is the lowest currency to USD. For the simplification of calculations, Iranians regularly use the term 'Toman'. 1 Toman equals 10 Rials.

Several reasons led to the decline of Iranian Rial; the war between Iran and Iraq, the threats faced by Israel, and the dangers of possible nuclear warfare. Due to this, measures such as restriction of 'Iran's access to the 'world's market were implemented, which ultimately caused significant losses to its economy. Iran was a major oil exporter, the country was also deprived of opportunities to export its oil. This again created a crucial deficit in 'Iran's national budget.

All of these events led to the dropping of the Iranian Rial as the lowest valued currency. The United States of America and the European Union, in 2016, lifted a few sanctions leading to an improvement of 'Iran's economic situation and stabilization of the Rial. However, in 2018, The United States of America imposed and sharpened their sanctions again.