The Gross Domestic Product or GDP, adjusted to extract the direct artificial injection of governmental funds but leaving private sector "stimulus funds" in place to measure their effectiveness
You can see the impact of stimulus attempts in 2009 and 2010 but then the bankruptcies began and the free market private sector went flatline
Also note the impact of panicky contractions in 2007 and 2008 leading up to the collapse of the housing bubble
(https://conservativepoliticalforum.com/proxy.php?request=http%3A%2F%2Fwww.4408.us%2Fgdp.jpg&hash=2a967bca353f50b1fcacb29fd51aa52657886f4b)