Tribes under threat : the collective behavior of firms during the stock market crisis

Due to their unpredictable behavior, stock markets are examples of complex systems. Yet, the dominant analysis of these markets as- sumes simple stochastic variations, eventually tainted by short-lived memory. This paper proposes an alternative strategy, based on a stochastic geometry defining a robust index of the structural dynamics of the markets and based on notions of topology defining a new coef- ficient that identifies the structural changes occurring on the S&P500 set of stocks. The results demonstrate the consistency of the random hypothesis as applied to normal periods but they also show its in- adequacy as to the analysis of periods of turbulence, for which the emergence of collective behavior of sectoral clusters of firms is mea- sured. This behavior is identified as a meta-routine.

Active versus passive management : the case of BOVESPA

Mestrado em Finanças

Household portfolio allocation, risk attitudes and credit constraints : evidence from the eurozone

Mestrado em Economia Monetária e Financeira

The introduction of a financial transaction tax in Italy

Mestrado em Finanças

Reading keys in the communication of wine in China. Wine marketing strategies

Mestrado Vinifera Euromaster - Instituto Superior de Agronomia - UL

Timing and economic value of mergers and acquisitions

Doctor of Philosophy in the Faculty of Business Administration

The meaning of implied volatility in pricing stock options traded in options markets

Ph.D. in the Faculty of Business Administration

Size anomalies in EU bank stock returns

Mestrado em Finanças