3. a. Indicate the type of the market structure and whether each of the rms below are making an economic prot or an economic loss and suggest whether or not they will stay in production in the short run. [9 marks] Diagram 1 Diagram 2 Im: E {MC 600 f -. I." 600 ." I. I' ' son I 500 { ave I! AVG 400 _ 1': {1\" 300 J ' f D=MR=AR D=MR=AR 200 100 102030405060?08090100Q 102030405060708090100 3. b. A monopolist is faced with the following cost and revenue curves: [10 marks]