The term "illegitimate business" refers to an illegal activity that is conducted for financial gain. However, there are several synonyms for this term, including "black market," "underground economy," "criminal enterprise," and "shadow economy." The black market refers to the buying and selling of goods and services that are illegal or unregulated. The underground economy is an unofficial market that operates outside the reach of government regulation, taxation, and enforcement. A criminal enterprise refers to a group of individuals or organizations that engage in illegal activities for gain, such as money laundering, human trafficking, and drug smuggling. Finally, the shadow economy includes all economic activity that is not officially recorded, such as cash transactions and off-the-books employment.