With a population of over 1.3 billion, China is the most populated country and the second largest economy in the world as of 2013. The labour market participation rate is high, because the social security system is basic with limited coverage. Industrial relations have been developed within the broader context of economic and labour market transformation. Governments of all levels, and the labour authorities and other law enforcement departments within these governments, are responsible for law enforcement. They are also involved in the mediation and arbitration of labour disputes.