On April 1, Martha opens a joint bank account with Ned and deposits $1,000. Ned deposits $500 into the account on April 2. On May 2, Martha withdraws $750. Two days later, Ned withdraws $600.

Question

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Martha's withdrawal leaves the account with $750 less, and when Ned withdraws $600, it implies that the remaining balance was at least that amount, which would not have been possible without Martha's initial deposit. Thus, the difference in their contributions and withdrawals indicates Martha has effectively given Ned $100 more in shared resources than she has taken for herself.

On April 1, Martha Opens a Joint Bank Account with Ned