Members of Argentina’s banking association, known as Adeba, are working on a last-minute plan to help the country avoid default, according to people familiar with the matter. News of the plan came as Argentina’s economy minister said late Tuesday that the country would continue negotiations on Wednesday with holdout investors after failing to reach a deal during a full day of talks. Argentina needs to reach an agreement with the investors by Wednesday to prevent a default, which would be its second in 13 years.