The book '' Inequality Collection '' contains 33 articles compiled by the Economic Analysis Group over the past three years. The first ten analyzes of the collection outline the reality of inequality. Today, the strong consensus from the economists, the international institutions to the government and the public, is that inequalities in countries have been increasing over the past 30 years, regardless of whether they are industrialized, emerging or developing countries. This increase is likely to threaten the established political, economic and social order. Based on richer data than in the past, many empirical works have highlighted many different dimensions of inequality, which were initially only studied extensively in economic terms. The next ten articles of the collection initially focus on several analysis of the relationship between inequality, globalization, technology and finance.