Index cohesive force analysis reveals that the US market became prone to systemic collapses since 2002.

PLoS One · 2011 · PMC3083438 · PMID 21556323

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a negative trendno p-value reported

a positive trendno p-value reported

A second significant entropy fall is detected at September 2008 when the index dynamics switched from a negative trend to a positive trend.

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