Louis Bachelier's Theory of Speculation: The Origins of Modern FinanceFrench doctoral student, Louis Bachelier, successfully defended his thesis Th orie de la Sp culation at the Sorbonne. This book provides a new translation of Bachelier's seminal work. Bachelier's thesis is a remarkable document on two counts. In mathematical terms Bachelier's achievement was to introduce many of the concepts of what is now known as stochastic analysis. His purpose, however, was to give a theory for the valuation of financial options.