Such issues will be discussed in more detail in Section 4. The correlation is positive and strong. The strength of this relationship is stronger in the upper part of the wage distribution (the 90th/50th percentile ratio) than in the lower part of the distribution (the 50u7l0Ih percentile ratio).8 This finding is consistent with similar evidence provided in Corak (2013) and in Jerrim and Macmillan (2014).