Line chart - The simplest form, based upon the closing rates (in each time unit), forming a homogeneous line. (Such chart, on the 5-minutes scale, will show a line connecting all the actual rates every 5 minutes).

The ECI tracks movement in the cost of labor which includes wages, fringe benefits, and bonuses for employees at all levels of involvement. The Bureau of Labor surveys over 3,000 private sector firms and over 500 local governments, schools and other public sector organizations.