Watch the CNBC video "Why Americans Fell Out Of Love With Canned Tuna". Take copious notes while watching the video. From the contents of the video, identify examples of the following microeconomic concepts: explicit costs, implicit costs, normal profit, economic profit, fixed costs, variable costs, marginal costs, short run, long run, economies of scale, minimum efficient scale and sunk costs. Answer the following questions: a) why are profit margins extremely low in the canned tuna business? b) using the principles of market economics and the tools of supply and demand, explain how changing market conditions have affected producers competing in the canned tuna industry c) explain the price fixing scandal presented in the video.