La expresión segunda mano se refiere a un objeto, el cual puede ser material o conceptual, que es transferido de una persona a una segunda, o posterior al usuario inicial. Segunda mano también puede simplemente referirse a que (tanto objeto material o conceptual) ya no está en la misma condición en que estaba cuando fue adquirido por primera vez, tambien puede referirse a que un objeto haya pasado del fabricante/mayorista/minorista al consumidor aun que este no use el producto.

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A secondhand or used good is one that is being purchased by or otherwise transferred to a second or later end user. A used good can also simply mean it is no longer in the same condition as it was when transferred to the current owner. When "used" means an item has expended its purpose (such as a used diaper), it is typically called garbage, instead. Used goods may be transferred informally between friends and family for free as hand-me-downs, or they may be sold for a fraction of their original price at garage sales or in church bazaar fundraisers. Governments require some used goods to be sold through regulated markets, as in the case of items which have safety and legal issues, such as used firearms or cars; for these items, government licensing bodies require certification and registration of the sale, to prevent the sale of stolen, unregistered, or unsafe goods. As well, for some high-value used goods, such as cars and motorcycles, governments regulate used sales to ensure that the government gets its sales tax revenue from the sale.

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