Wage dispersion is one of the social and economic issues arousing public concern in Hong Kong. In foreign studies on wage dispersion, Oaxaca-Blinder decomposition, originated from Oaxaca (1974) and Blinder (1973), is a common method of decomposing changes or differences in mean wages between two groups into wage structure effect and composition effect, and then further decomposing the two effects into contributions of each control variable. This book adopts a distributional approach proposed by Firpo, Fortin and Lemieux (2007) to study the changes in the entire wage distribution instead of summary measures in Hong Kong since 1980s.