I am looking for the ways of documenting economic changes.
For nearly fifty years, Gross Domestic Product (GDP) has been used as an indicator of national progress in most of the world. Indeed, the terms 'GDP', 'growth', and 'progress' are often used interchangeably. However, it is not a perfect indicator. It measures only expenditures, regardless of their reasons. Thus, unemployment may have no effect on GDP, and the contributions made by household or volunteer work are ignored. In addition these statistics are often flawed. See http://www.shadowstats.com/cgi-bin/sgs? for an opinion of how ...
Using statistical data and analysis to determine the state of the economy. References.