This dissertation comprises three independent essays on empirical development and labour economics using data from both the UK and China. Chapter 1 provides the first economic investigation into the treatment effect of the Equality Act (EA) 2010 in Great Britain, which replaced the previous UK Disability Discrimination Act (DDA) 1995, and studies its consequences on disabled people’s labour market status. I find optimistic evidence that the policy change improved the employment and wages of the disabled. In the last two chapters, I study the effects of migration on families and family members left behind,focusing on the case of China’s Great Migration. In particular, Chapter 2 presents new evidence on the impact of daughters’ and sons’ migr...