See Chapter 2 of OECD (2011b) and also Koske et al. ( See OECD (2011b) and Koske et al. ( Fournier and Koske (2012) focus on the effects of structural policies on earnings dispersion by means of quantile regressions based on wages. Chapter 2 of OECD (2011b) also focuses on the effects of structural policies on earnings dispersion by looking at various earnings deciles ratios (d9/dl, d5/dl and d9/d5).