If you have learned the theory of venture capital, you can use a margin lower than the expected price to place an order first, but you will need to pay the shortfall when completing the order.

For example, you have 10 million, and you place an order to receive an item worth 12 million. At this time, a player appears willing to sell it to you. At this time, you need at least 2 million in your account to finally complete the order. (Another 10 million has been handed over to the market as a prepayment when placing the order).

This principle is the same as futures. For example, in futures, you can use 100,000 to book 1 million futures, but when it comes to delivery, you need to pay another 900,000 to complete the transaction. If you can't get 900,000 , naturally this transaction cannot be completed.

Maybe this is your question? Because your question is not very precise.

There are scammers who specialize in using this trick to defraud money from guitars. They sell useless official outfits at high prices and use their vests to post higher receipts in the market. When you want to buy them and resell them to make a profit, you find that the seller I won’t go out (because the person who placed the order did not reserve enough money to complete the transaction)