The State-World Model simulates the response of a state to changes in the resources of the outside world. The world economy grows slowly before discovery and use of fossil fuels; then with abudant fuels it goes through a maximum of assets and available goods and services; and finally goes down as fuel resources decline.
- Q = world assets
- S = world soils
- F = world fuels
- W = state water
- U = state assets
- Q: D1 = k1*S*F*Q + k2*S*Q - k3*Q + k8*S
- S: D2 = I - k5*S*F*Q - k6*S*Q - k7*S
- F: D3 = - k4*S*F*Q
- W: D4 = J - L1*W*U*Q - L3*W - L5*W
- U: D5 = L2*U*Q*W + L4*W - L6*U - L*U
The graph shows the changes of S(red), F(green), Q(blue), W(orange) and U(magenta) over a time period.
- This model can be used for any nation or state which depends on imports and exports:
- Florida: it imports fuels and goods and exports oranges, vegetables and tourist services.
- Japan: it imports fuels and raw products and exports finished electronic goods.