Economic activity rate, EAR (or labor force participation rate, LFPR), is the percentage of the population, both employed and unemployed, that constitutes the manpower supply of the labor market, regardless of their current labor status.
This figure is a measure of the degree of success of the economy in engaging the population in some form of production activity.
It is an indicator that also reflects demographic trends.
References
Economic activity rate Wikipedia(Text) CC BY-SA