Figure 1: Prices during 2009 for Katalina Yachts OHNWDUIUI Notes: time, in weeks, is on the horizontal axis. Price is on the vertical axis. At the start of 2009, following the bankruptcy of its competitors, Katalina Yachts was the only supplier of luxury sailing yachts in the North American market. The gure above shows the transaction prices for yachts sold by Katalina during this period (starting at point A) and the periods that followed. At point B, one competitor, Flying Fifteen Yachts, makes it out of bankruptcy proceedings and starts trading again. Both Katalina and Flying Fifteen have massive production facilities that can easily accommodate the market demand at the time and neither are producing at anything close to capacity. Further, their yachts are regarded as essentially perfect substitutes (that said, each yacht is very slightly different due to the owner's specic tastes and so prices differ from yacht to yacht slightly). Finally, it is well understood in the market that, due to being able to restructure labor contracts during the bankruptcy process, Flying Fifteen has a marginal cost $1 lower than that of Katalina. Given the above information, answer the following questions: a) How would you describe the market structure prior to point B? (one word)