We discuss some methods to quantitatively investigate the properties of correlation matrices. Correlation matrices play an important role in portfolio optimization and in several other quantitative descriptions of asset price dynamics in financial markets. Specifically, we discuss how to define...

The concentration of global wealth, power, knowledge, authority and prestige continues unabated. Antitrust enforcement has been at the heart of debates on combating increasing inequality. Yet, the transformation possibilities have been overstated, while its impact has been paralyzed by...