Fig. 1From: Attention to social stratification in the public discourse: An empirical study based on big data of books (1949–2008)The trends of social class concern by macroeconomics, income inequality, political participation, and public opinion Note: (1) LC: Literary References to Class; (2)GDP: Gross Domestic Product (3) GINI: Gini Index (4) PDI: Participatory Democracy Index; (5) IO: Index of Public OpinionsBack to article page