ANSWER
The correct answer is Inflation.
EXPLANATION
Inflation is the generalized and sustained increase in the prices of goods and services in a country for a sustained period of time, usually one year. When the general price level rises, less goods and services are acquired with each unit of currency. That is, inflation reflects the decrease in the purchasing power of the currency: a loss of the real value of the internal means of exchange and unit of measure of an economy. To measure the growth of inflation, indices are used, which reflect the percentage growth of a weighted 'basket of goods'. The measurement index of the infringement is the Consumer Price Index (CPI).
