Because of their market positions, Coles and Woolworths exhibit a great deal of interdependence and actively advertise against each other. In particular, Coles has been successful with their "Down Down" campaign. Briefly explain what this campaign is, and explain the effect you think it has had on the market position and profitability of both Coles and Woolworths. Draw appropriate diagrams for this market showing the market outcomes for Coles and Woolworths. (6 marks)