Business activities in Brazil are generally only regulated for compliancy and, for most areas, anybody meeting the compliancy regulations of their business activity can freely operate their business in Brazil.
The most common tool that the Brazilian government regulate markets with is through public tenders, where the government sets the conditions under which it wants a service or merchandise to be provided. The government uses pre-defined parameters in order to decide to which private - national or foreign - company it will concede the “controlled monopoly” of the sector.
Apart from the public tender cases, street vendors and hunters require specific licenses that can only be obtained under very specific conditions. Hunting is forbidden in Brazil, except for cases of biological control where a certain species needs to have its numbers lowered. Street vendors need to have a specific license, that is only granted by the municipality after a thorough study of where the street vendor will work. The municipality also limits the number of street vendors in each city.