An agrarian system is the dynamic set of economic and technological factors that affect agricultural practices. It is premised on the idea that different systems have developed depending on the natural and social conditions specific to a particular region. Political factors also have a bearing on an agrarian system due to issues such as land ownership, labor organization, and forms of cultivation. As food security has become more important, mostly due to the explosive population growth during the 20th century, the efficiency of agrarian systems has come under greater review.