please help me answer this questionYou can refer to this book, the question is on page 716many thanksplease Please answer your original answer, don't miss any question and be detailed, thank you Environmental and Natural Resource Economics A Contemporary Approach Fifth Edition

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Exercise Suppose that a fishery is characterized by the following relationship between total fish stock and annual growth (ignore the third column for now): Stock (thousand tons Annual Growth Number of Boat Trips Required to Catch biomass) (tons) Annual Growth 10 0 - 20 800 2300 30 1,600 2200 40 2,500 2,100 50 2 500 2000 &0 3,100 1,600 70 3,200 1,300 80 3,000 1,000 90 2,700 800 100 2,500 600 110 1,500 400 120 1,200 200 150 500 100 140 ] o a. First, construct a graph showing the relationship between stock and growth, similar to Figure 18.2. Identify on your graph the stock levels that correspond to the maximum sustainable yield, and the stable and unstable equilibrium stock levels for this fish population in a natural state. b. Next, present a table showing the population growth rate, expressed as a percentage, at each stock level. For example, with a stock of 50,000 tons, the annual growth is 2,800 tons, or 5.6%. What stock level maximizes the population growth rate? What point in Figure 18.1 does this growth rate correspond to (A, B, C, or D)? c. Suppose you are a resource manager overseeing this fishery. You want to ensure the ecological sustainability of the fishery by requiring that annual harvest should equal annual natural growth. You have collected data on the number of boat trips required to catch the annual growth of fish at different population stocks. This is given in the third column in the preceding table, which can be read from bottom to top to show increasing fishing effort. Assume that it costs $1.000 to operate a boat trip and that fish sells for 31,000 per ton. You must determine the annual quota for fish catch (in tons) and the population level you wish to maintain. What level of fishing effort maximizes economic efficiency while still being ecologically sustainable? Show your work. (Hint: Caleulate industry revenues, costs, and profits for each level of fishing effort from 0 te 2,300.) Present a graph similar to Figure 18.5 showing total revenues and total costs to support your answer. Total Population Logistic Curve Time Figure 18.1 Species Population Growth Over Time Total Revenue and Total Costs 1 I ! 1 1 I 1 1 1 1 1 E* Ewsy Eo E; Fishing Effort Figure 18.3 Total Revenues and Total Costs in a Fishery Note: Points Xp, Xusy, and Xi correspond to the same fishery stock points in Figure 18.2. Fishing effort goes from left to right in Figure 18.3, but from right to left in Figure 18.2. Annual Growth Extinction Decreasing Harvest Increasing Harvest MSY Ha Natural Equilibrium X min XL XMSY XH Xmax Stock Figure 18.2 Species Population and Annual Growth Note: MSY - maximum sustainable yield