The major barriers are described in Exhibit 2-5 with accompanying definitions. A variety of specific barriers can be identified within the six areas suggested by Exhibit 2-5. For example, cost advantage may He due to volume production, design efficiency, and experience. A study of Fortune 500 executives in a simulated business environment found all of the six barriers to be relevant.19 Cost advantages were viewed as the most important entry barrier, with capital requirements second and product differentiation third. No distinct relative importance pattern was found for the other factors.