English to Portuguese Bus/Financial Finance (general)

There are times when TixWix contracts with low probability of payout do not have a bid in the market to close a position when a quote is requested. The width of the bid/ask market on quotes for these low probability contracts is typically very wide as a percentage of the price paid for the contract. The underlying index will need to move substantially in your favor in order for the contract to gain enough value to close out the contract before expiration.

Trata-se de um texto sobre contratos de opções. Referências, por favor.