WOLFRAM SYSTEM MODELER
| Level1bGeneral System Dynamics level with no inflow |  | 

SystemModel["SystemDynamics.Levels.Level1b"]

| x0 | Value: 0 Type: Real Description: Initial condition | 
|---|
| level | Type: Real Description: Continuous state variable | 
|---|
|  | u1 | Type: MassInPort Description: Outflow variable | 
|---|---|---|
|  | y | Type: MassOutPort Description: State variable | 
|  | y1 | Type: MassOutPort Description: State variable | 
|  | y2 | Type: MassOutPort Description: State variable | 
|  | y3 | Type: MassOutPort Description: State variable | 
|  | y4 | Type: MassOutPort Description: State variable | 
|  | Integrator1 | Type: Integrator Description: Output the integral of the input signal with optional reset | 
|---|---|---|
|  | Gain1 | Type: Gain Description: Output the product of a gain value with the input signal | 
|  | SystemDynamics.WorldDynamics.World3 Arable land dynamics | 
|  | SystemDynamics.WorldDynamics.World3 Utilization of non-recoverable natural resources |