Answer:
legal system
Explanation:
There are five basic legal systems used in different countries around the world: civil law, common law, customary law, religious law, and mixed legal systems.
Generally business operations are included under common law (US and UK + former colonies) or civil law (based on Roman law used in most of Europe and Latin America), at least in western countries. This includes both North and South America, western European countries, and Australia + NZ.
Personally I don't know about the rest of the non western countries.