This paper presents a tractable model of non-linear dynamics of market returns using a Langevin approach.Due to non-linearity of an interaction potential, the model admits regimes of both small and large return fluctuations. Langevin dynamics are mapped onto an equivalent quantum mechanical (QM)...

In general, the properties of the conditional distribution of multiple period returns do not follow easily from the one-period data generating process. This renders computation of Value-at-Risk and Expected Shortfall for multiple period returns a non-trivial task. In this paper we consider some...

Classical quantitative finance models such as the Geometric Brownian Motion or its later extensions such as local or stochastic volatility models do not make sense when seen from a physics-based perspective, as they are all equivalent to a negative mass oscillator with a noise. This paper...

Asset price bubbles have fascinated economists for decades. In consequence, the literature on bubbles and their detection is abundant, with many researchers taking very opposite positions on the topic, however. This survey gives a structured overview of the two branches of research that have...

In previous papers we have shown another interpretation of the irrationality of financial market agents. Another methodology has been proposed. But it also shown that others questions might be highlighted from both epistemological and social welfare point of view. This paper tries to go further...

The Brazilian capital markets, in special the stock market, apparently had great development in the 90's - mainly when one considers market capitalization, traded volume and new issues. However, several signs of decline appeared at the end of the decade - decline in volume traded and new issues....

Although the efficient market hypothesis (EMH) is the leading theory describing the behavior of financial markets, researchers have increasingly questioned its efficacy since the 1980s because of its inconsistencies with empirical evidence. This challenge to EMH has resulted in the development...

The term “financial psychopath” was coined after the financial crisis of 2007−2008. Intended as a term of derision, the media used it to negatively label financial professionals, rather than to draw a clinical profile. The expression succinctly conveys the widespread post−2008 public...

This chapter discusses the role of speculation in the financial markets that influences individual and group behavior in the form of bubbles and crashes. The chapter highlights behavioral finance issues associated with bubbles, such as overconfidence, herding, group polarization, group-think...

This research considers the strategies on the initial public offering of company equity at the stock exchanges in the imperfect highly volatile global capital markets with the nonlinearities. We provide the IPO definition and compare the initial listing requirements on the various markets. We...