Question #2. Attached (below) is a diagram of a bio-economic model reflecting the relationships between the biological growth of a stock of fish and three different rates of harvest—H1, H2, and H3.  In this model, dX/dt=F(X)—the change in the stock with respect to time and biomass— is captured in the parabola.  Use the diagram to answer the following questions. On the diagram, the point A refers to a specific and important biological point on the growth curve. What is this point and what is its significance? On the diagram, the point B refers to a biologically important value.  What is this value and what is its significance? Consider point C on the diagram.  Assume that the stock of fish is just to the right of this point, but still to the left of B.  Assume the harvest level is maintained at H3. Over time, what would happen to the stock of fish and the size of the harvest?

ENGR.ECONOMIC ANALYSIS
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Chapter1: Making Economics Decisions
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Question #2. Attached (below) is a diagram of a bio-economic model reflecting the relationships between the biological growth of a stock of fish and three different rates of harvest—H1, H2, and H3.  In this model, dX/dt=F(X)—the change in the stock with respect to time and biomass— is captured in the parabola.  Use the diagram to answer the following questions.

  1. On the diagram, the point A refers to a specific and important biological point on the growth curve. What is this point and what is its significance?
    1. On the diagram, the point B refers to a biologically important value.  What is this value and what is its significance?
    2. Consider point C on the diagram.  Assume that the stock of fish is just to the right of this point, but still to the left of B.  Assume the harvest level is maintained at H3. Over time, what would happen to the stock of fish and the size of the harvest?
    3. Consider point D on the diagram.  Assume the stock of fish is just to the right of  D but still to the left of A.  Assume the harvest level is maintained at H3. Over time, what would happen to the stock of fish and size of the harvest?
    4. Consider point D on the diagram.  Assume the stock of fish is just to the left of this point but still to the right of O.  Assume the harvest level is maintained at H3.  Over time, what would happen to the stock of fish and size of the harvest?
    5. Over time, what will happen to the stock of fish and size of the harvest if H1 level of harvest persists?

 

Instantaneous
Growth F(X)
O D
A
H1
H2
H3
CB
Transcribed Image Text:Instantaneous Growth F(X) O D A H1 H2 H3 CB
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