| Variables | Types | Variable Expression | System |
|---|---|---|---|
| Production scale of resource-oriented enterprises | State | INTEG (Rate of change of production scale of resource-oriented enterprises,70) | Economy |
| Inventory of resource-oriented enterprises | State | INTEG (IF THEN ELSE(Production rate of recycled products> Delivery rate of resource-oriented enterprises, 0, (Production rate of recycled products - Delivery rate of resource-oriented enterprises)),70) | Logistics |
| Inventory of dealers | State | INTEG (Supply rate of external recycled products + Delivery rate of resource-oriented enterprises – Rate of market demands of recycled products,200) | Logistics |
| Production rate of recycled products | Rate | DELAY1(MIN(Optimal recycled production of resource-oriented enterprises, Production demands of resource-oriented enterprises), production delay) | Logistics |
| Supply rate of external recycled products | Rate | DELAY1(orders of dealers- Delivery rate of resource-oriented enterprises, transportation delay) | Logistics |
| Delivery rate of resource-oriented enterprises | Rate | DELAY1(MIN(orders of dealers, Optimal recycled production of resource-oriented enterprises), transportation delay) | Logistics |
| Rate of change of production scale of resource-oriented enterprises | Rate | Production scale of resource-oriented enterprises*(Limit production of recycled products transformation - Production scale of resource-oriented enterprises)* Earnings of resource-oriented enterprises *coefficient of change of resource-oriented enterprises | Economy |
| Production demands of resource-oriented enterprises | Auxiliary | MAX(0, Sales forecast of resource-oriented enterprises +(expected inventory of resource-oriented enterprises -inventory of resource-oriented enterprises)/time for inventory adjustment of resource-oriented enterprises) | Logistics |
| Sales forecast of resource-oriented enterprises | Auxiliary | SMOOTH(Delivery rate of resource-oriented enterprises, average transfer period) | Information |
| Earnings of resource-oriented enterprises | Auxiliary | Ex-factory price of recycled products* Orders of dealers +governmental subsidiaries *(Orders of dealers + inventory of resource-oriented enterprises)-storage cost * inventory of resource-oriented enterprises – management cost of resource-oriented enterprises *(Orders of dealers + inventory of resource-oriented enterprises) | Economy |
| Sales forecast of dealers | Auxiliary | SMOOTH(Rate of market demands of recycled products, average transfer period) | Information |
| Orders of dealers | Auxiliary | MAX(0, Sales forecast of dealers +(expected inventory of dealers - inventory of dealers)/ time for inventory adjustment of dealers) | Logistics |
| Optimal recycled production of resource-oriented enterprises | Auxiliary | MIN(Limit production of recycled products transformation, Production scale of resource-oriented enterprises) | Logistics |