Yu (2014) uses data from the 2010 China Family Panel Studies (CFPS), and finds that married women's labour market time and level of earnings are negatively associated with their time spent on housework. Her findings indicate a phenomenon called "gender display" whereby wives fail to reduce their housework time even as their relative earnings increase to the point that they earn more than their husbands. Time use surveys (TUS) have been invaluable in estimating the time contributed by household members and in measuring all forms of work.