Final answer:
The informal sector comprises unregulated economic activities like unregistered businesses and undocumented payments, lacking legal protections and benefits.
Explanation:
Informal sector refers to unregulated economic activities such as unregistered businesses, undocumented payments, coerced labor, and bartering. This sector lacks legal protections, benefits, and employment contracts, with examples ranging from street vendors to unlicensed construction workers. It plays a significant role globally, accounting for a large portion of employment in many countries.
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