UW-Madison AFROAMER 343 - lecture 21 aae 343 spring 2013 for students (16 pages)

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lecture 21 aae 343 spring 2013 for students



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lecture 21 aae 343 spring 2013 for students

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Pages:
16
School:
University of Wisconsin, Madison
Course:
Afroamer 343 - Marxism and the Black Experience

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Topics Today 4 9 13 Classroom game Managing open access renewable resources 1 Renewable Resources Wind energy solar energy flow of energy this period unrelated to flow of energy last period Plants and animals growth depends on current stock Groundwater some aquifers are recharged 2 Biological growth growth The next few slides build intuition about the relationship between stock levels growth and harvest The main reason to consider this graph is to examine the difference between the traditional goal of fisheries management and the goal typically advocated by economists maximum sustained yield vs efficient sustained yield Carrying capacity Sk stock 3 Biological growth growth Sk stock Point of critical dispensation 4 Sustained yield harvest Stock dynamics are given by St 1 St G St Ht Sustained yield harvest is the harvest where the stock doesn t change over time St 1 St And so it must be that for sustained yield harvest G St Ht Growth harvest Growth curve Harvest level hMSY Harvest level h 0 S B S MSY S A Sk Stock 5 There are many sustained yield stock levels for a biological renewable resource Growth harvest Growth curve Harvest level hMSY harvest level Harvest level h 0 S B S B S MSY S A S A k Stock 6 A few questions about the dynamics of the stock Q1 If the stock is at SMSY and harvest is constant over time at h where does the stock end up in the long run i e what is the sustainable stock level A SMSY B S A C S B D 0 E NIW Growth harvest Growth curve Harvest level hMSY harvest level Harvest level h 0 S B S B S MSY S A S A Stock 7 A few questions about the dynamics of the stock Q2 If the stock is at SB and harvest is constant over time at h hat where does the stock end up in the long run A SMSY B S A C SB hat D 0 E NIW Growth harvest Growth curve Harvest level hMSY harvest level Harvest level h 0 S B S B S MSY S A S A Sk Stock 8 A few questions about the dynamics of the stock Q3 If harvest is constant over time at h what is the range of stock levels at which the long



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