A combination of waste management legislation and the competitive tendering of public services that requires all operators to meet the same criteria has generally ensured a level playing field and has enabled the emergence of private sector waste management companies around the world, serving both public (municipal) and private (large waste generating) clients. There are some very large international service providers but also major national companies and a multiplicity of local small- and medium-sized enterprises, in both developed and developing countries. Global turnover of the industry in 2011 was around 640 billion USD, of which 95% was in Asia, Europe and the Americas.