Compra e venda imediata (de ações); transação fictícia

A fictitious type of arrangement whereby a broker, upon receiving an order from one individual to purchase and an order from another individual to sell a certain amount of a particular stock or commodity, transfers it from one principal to the other and retains the difference in value.

The illegal buying of stock by a seller's agents to give the impression of an active market.
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Fonte: Answers.com