Some is because firms – Microsoft and drug companies are good examples – have learned better how to erect and maintain entry barriers, often assisted by conservative political forces that justify lax anti-trust enforcement and the failure to limit market power on the grounds that markets are “naturally” competitive.
Alguns do aumentos no poder de mercado é o resultado de mudanças na tecnologia e estruturas económicas: consideremos as economias de rede e o crescimento de indústrias do setor de serviços fornecidos localmente.