conducive to democratization - which Inglehart and Welzel call "self-expression values" - emerge. Nonetheless, these efforts to revive modernization theory were criticized by many (see the section on "Criticisms and alternatives" below), and the theory remained a controversial one. Modernization and democracy The relationship between modernization and democracy or democratization is one of the most researched studies in comparative politics. There are many studies show that modernization has contributed to democracy in some countries. For example, Seymour Martin Lipset argued that modernization can turn into democracy." There is academic debate over the drivers of democracy because there are theories that support economic growth as both a cause and effect of the institution of democracy. "Lipset's observation that democracy is related to economic development, first advanced in 1959, has generated the largest body of research on any topic in comparative politics," Larry Diamond and Juan Linz, who worked with Lipset in the book, Democracy in Developing Countries: Latin America, argue that economic performance affects the development of democracy in at least three ways. First, they argue that economic growth is more important for democracy than given levels of socioeconomic development. Second, socioeconomic development generates social changes that can potentially facilitate democratization. Third, socioeconomic development promotes other changes, like organization of the middle class, which is conducive to democracy. As Seymour Martin Lipset put it, "All the various aspects of economic development—industrialization, urbanization, wealth and education—are so closely interrelated as to form one major factor which has the political correlate of democracy". The argument also appears in Walt W. Rostow, Politics and the Stages of Growth (1971); A. F. K. Organski, The Stages of Political Development (1965); and David Apter, The Politics of Modernization (1965). In the 1960s, some critics argued that the link between modernization and democracy was based too much on the example of European history and neglected the Third World. One historical problem with that argument has always been Germany whose economic modernization in the 19th century came long before the democratization after 1918. Berman, however, concludes that a process of democratization was underway in Imperial Germany, for "during these years Germans developed many of the habits and mores that are now thought by political scientists to augur healthy political development". One contemporary problem for modernization theory is that it is highly contentious that modernization implies more human rights, with China in the 21st century being a major test