Information security implemented in: The theory on stock market efficiency, Markowitz's portfolio theory and porter's value chain

Abstract

Porter's value chain has for several years been quite popular. I will deal with information security and Porter's value chain. Two other very interesting theories that I will put in relation to ISEC, are those of Markowitz's portfolio theory and the theory on stock market efficiency. Information security is a pioneering field and an area that is continously undergoing change. It can be of help to have a theoretical basis from where to approach the area, and, to a certain degree, an interdisciplinary approach is necessary to be able to handle the very large and difficult area of information security.