List of national legal systems
Common law is currently in practice in Ireland, most of the United Kingdom (England and Wales and Northern Ireland), Australia, New Zealand, Bangladesh, India (excluding Goa), Pakistan, South Africa, Canada (excluding Quebec), Hong Kong, the United States (on a state level excluding Louisiana), and many other places. In addition to these countries, several others have adapted the common law system into a mixed system. For example, Nigeria operates largely on a common law system, but incorporates religious law.
Competition law
By 2008 111 countries had enacted competition laws, which is more than 50 percent of countries with a population exceeding 80,000 people. 81 of the 111 countries had adopted their competition laws in the past 20 years, signaling the spread of competition law following the collapse of the Soviet Union and the expansion of the European Union. Currently competition authorities of many states closely co-operate, on everyday basis, with foreign counterparts in their enforcement efforts, also in such key area as information / evidence sharing.