379. Damages for delay on voyage.

Where shipowner and charterer can reasonably be assumed to know when concluding the charter that the cargo is destined to a place where there exists a market for goods of that kind, then, if the market price has fallen between the date at which the goods should have arrived and the date at which they did arrive, the measure of damages for breach of contract by the shipowner for late delivery is prima facie the difference in market price