One conclusion to draw is that at an earlier stage of development such rules of inheritance were very useful ways of organizing property and status. Thus some social myths became extremely widespread, breaking down geographical, cultural and linguistic barriers. These social myths then entered the families of millions of people around the world. Yet few know why they follow these customs, hence the title myth. Since in-depth knowledge of history is necessary to understand its development, it is acceptable to forget its origins. Castillo's example of Middle Eastern culture affecting Mexico falls into the same category. It is, however, incredibly interesting that so few pursue research on such topics. Clearly, primogeniture was created to fit its historical context. In fact, understanding its importance in the Middle Ages helps to see how obsolete it is today. However, the disinterest in the roots of tradition leads to a delay between the questioning of customs and the fall of the system for which it was created. The purpose of writings like Castillo's is to highlight such outdated customs, allowing society to take a step forward