Ito calculus without probability in idealized financial markets

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Abstract

We consider idealized financial markets in which price paths of the traded securities are cadlag functions, imposing mild restrictions on the allowed size of jumps. We prove the existence of quadratic variation for typical pricepaths, where the qualification "typical" means that there is a trading strategy that risks only one monetary unit and brings infinite capital if quadratic variation does not exist. This result allows one to apply numerous known results in pathwise Ito calculus to typical price paths; we give a brief overview of such results.
Original languageEnglish
Number of pages25
Publication statusPublished - 3 Aug 2011

Keywords

  • pathwise Ito calculus
  • pathwise quadratic variation
  • cadlag price paths

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