The ''unidad de inversión'' (UDI, literally "investment unit",

ISO 4217 ISO 4217 is a standard published by the International Organization for Standardization (ISO) that defines alpha codes and numeric codes for the representation of currencies and provides information about the relationships between individ ...

code MXV) is an index unit of funds used in

Mexico Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundar ...

. It can be traded in many currency markets because its value changes with respect to currencies. The value of the UDI was first set at one

Mexican peso The Mexican peso (Currency symbol, symbol: $; ISO 4217, currency code: MXN; also abbreviated Mex$ to distinguish it from peso, other peso-denominated currencies; referred to as the peso, Mexican peso, or colloquially varo) is the official curre ...

on April 4, 1995, after the

Mexican peso crisis The Mexican peso crisis was a currency crisis sparked by the Mexican government's sudden devaluation of the peso against the U.S. dollar in December 1994, which became one of the first international financial crises ignited by capital flight. ...

. Unlike currencies, it is designed to maintain a constant purchasing power with respect to the general consumer price index and not be subject to

inflation In economics, inflation is an increase in the average price of goods and services in terms of money. This increase is measured using a price index, typically a consumer price index (CPI). When the general price level rises, each unit of curre ...

. The Mexican credit system (especially mortgages) uses the UDI rather than the peso because of its stability.ExchangeRate.com.
Accessed April 29, 2012. The plural form "UDIs" is often used, even in official government documents, but is regarded as grammatically incorrect. The following is a table of the value of the ''unidad de inversión'' on selected dates:

References

Financial markets Finance in Mexico 1995 establishments in Mexico {{finance-stub de:Mexikanischer Peso#Mexikanische Verrechnungseinheit