sábado, novembro 23, 2013

Leitura do dia - Probabilistic aspects of finance

Probabilistic aspects of finance

Hans Föllmer and Alexander Schied
Source: Bernoulli Volume 19, Number 4 (2013), 1306-1326.

In the past decades, advanced probabilistic methods have had significant impact on the field of finance, both in academia and in the financial industry. Conversely, financial questions have stimulated new research directions in probability. In this survey paper, we review some of these developments and point to some areas that might deserve further investigation. We start by reviewing the basics of arbitrage pricing theory, with special emphasis on incomplete markets and on the different roles played by the “real-world” probability measure and its equivalent martingale measures. We then focus on the issue of model ambiguity, also called Knightian uncertainty. We present two case studies in which it is possible to deal with Knightian uncertainty in mathematical terms. The first case study concerns the hedging of derivatives, such as variance swaps, in a strictly pathwise sense. The second one deals with capital requirements and preferences specified by convex and coherent risk measures. In the final two sections we discuss mathematical issues arising from the dramatic increase of algorithmic trading in modern financial markets.

Mais uma ótima discussão introdutória (mesmo) sobre probabilidade em finanças. É open acess, ainda melhor.