Is Japan's dual labour market such a big problem?

Japan’s dual labour market undoubtedly has some economic costs, as non-regular workers are much less productive than regular employees. However, the degree of labour market duality is not vastly different from other OECD countries, and the majority of non-regular workers are not looking for regular employment. A further deregulation of permanent employment contracts may therefore reduce labour market duality and boost growth only marginally.