1. Economic activity and trade that occurs outside official government regulation and taxation, typically involving small-scale vendors, street traders, and unregistered businesses
Many developing countries rely heavily on the informal market for employment and commerce.
Muitos países em desenvolvimento dependem muito do mercado informal para emprego e comércio.
2. A marketplace or trading area where goods are bought and sold without formal registration or licensing
She purchased handmade crafts from vendors in the informal market downtown.
Ela comprou artesanatos de vendedores no mercado informal do centro.