Thermodynamic Entropy in Quantum Statistics for Stock Market Networks

Figure 2

Entropy in NYSE (1987-2011) derived from Bose-Einstein and Fermi-Dirac statistics. Critical financial events, i.e., Black Monday, Friday the 13th mini-crash, Early 1990s Recession, 1997 Asian Crisis, 9.11 Attacks, Downturn of 2002-2003, 2007 Financial Crisis, the Bankruptcy of Lehman Brothers, the European Debt Crisis, etc. It is efficient to use thermodynamic entropy to identify critical events in NYSE.