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The trade-in of exotic animals being illegally sold as pets is a multi-billion-dollar-a-year industry that is not included in GDP as it is a part of the underground economy.
The term "underground economy" refers to economic activities that are thought to be illegal, either because they involve the exchange of illegal goods or services or because they don't follow the rules for government reporting. GDP and other economic metrics, such as unemployment, are less accurate because of the underground economic activity that is not reflected in official economic activity figures. Opioids and recreational drug use are made possible by the underground economy, which can be extremely harmful to users. Long-term effects include social issues like poor health and decaying cities and towns. low standards for safety and health. Along with illegal activity, the underground economy also includes unreported income from the production of legal goods and services, whether from cash or barter exchanges.
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