One-stop shops in the zones were seen to reduce regulatory compliance costs, but without fully satisfying firm managers (Warr and Menon 2015). Corruption and regulatory and policy uncertainty were ranked as major or severe constraints by a substantial percentage (74% and 34% respectively) of firms operating in SEZs in 2012 (World Bank, 2015b). Moreover, SEZ investments have traditionally faced the same constraints as non-SEZ investments (high costs of electricity and transport compared to neighbouring countries, low quality of labour and a general lack of skilled labour).