Before revision:  Information on one sender substitutes for information on the other, which allows the receiver to nullify the profitability of a deviation. We thus provide a novel channel through which competition  encourages information disclosure.
After revision:  Information on one sender substitutes for information on the other, which allows the receiver to nullify the profitability of a unilateral provision of less information. Thus, we provide a novel channel through which competition encourages information disclosure.