GDP is an economic index that a procurement professional can use to measure economic data.

Explanation

GDP = gross domestic product = "the monetary value of goods and services manufactured or sup-plied in a financial period". People use it to say whether a country's economy is strong or weak.

Stock markets look at the value of public limited companies within a country.

Commodity indices look at the value of commodities such as steel, oil and wheat at a point in time

Average changes in price over a year can be measured by CPI or PPI