By the late 20th century, Hong Kong was the seventh largest port in the world. Hong Kong is a full Member of the World Trade Organization. Hong Kong has also had an abundant supply of labour from the regions nearby. A skilled labour force and technology ensured that opportunities for external trade, investment, and recruitment were maximised. Prices and wages in Hong Kong are relatively flexible, depending on the performance and stability of the economy of Hong Kong. However, Hong Kong suffers from one of the highest income inequality in the world, as well as a growing housing affordability and shortage crisis among the population.