412
18. The Global Shrimp Market
cost-per-pound_aqua = 1.75 {or $3.85 per kg)
cost-per-pound_fisheries = 3
cost_to_operate-pond = 350
cost_to_operate_vessel = 10500
margin_aqua = Profit_aquaculture /(consuming*(lfisheries_market_share))
margin_fisheries =
Profit_fisheries/consuming*fisheries_market_share
Profit_aquaculture = revenues_aquacultureexpenses_aquaculture-investing_aquaculture
Profit_fisheries = revenues_fisheriesexpenses_fisheries-investing_fisheries
Market Demand
Actual_Price(t)
dt
INIT Actual_Price
Actual_Price (t-dt) + (chg_in-price) *
norrnal-price
INFLOWS:
chg_in-price = (expected-priceActual_Price) /time_to_chg-price
Expected_Consumption_Rate(t) =
Expected_Consumption_Rate(t-dt) + (chg_in_exp_rate) *
dt
INIT Expected_Consumption_Rate
consuming
INFLOWS:
chg_in_exp_rate = (consumingExpected_Consumption_Rate)/time_to_chg_exp_rate
Per_Capita_Consumption(t) = Per_Capita_Consumption(tdt) + (chg_in-per_capita) * dt
INIT Per_Capita_Consumption = .8
INFLOWS:
chg_in-per_capita = (expected_consumptionPer_Capita_Consumption)/time_to_change_cons
Population(t) = Population (t-dt) +
(change_in-population) * dt
INIT Population = 5850000000
INFLOWS:
change_in-population
Population*effective_Pop_growth_rate