ElasticityFractional rate of change is proportional to that of the influencing stock 
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In a dynamic relation, a given elasticity coefficient (coefficient
) implies that the fractional rate of change for an influenced stock B is proportional to the fractional rate of change for the influencing stock A, which is connected via the stockInfoInput
. The factor of proportionality in this case is called the Aelasticity of B. The rate of change for the stock B that is connected to the flowPort
accordingly is given by the following equation, which uses Newton's dot notation for rates:
coefficient = 1
the input u can be used to provide a variable elasticity coefficient.hasRateOutput 
Value: false Type: Boolean Description: = true, if the rate is reported via real output connectors 

coefficient 
Value: 1 Type: InputType Description: Constant coefficient 
hasFactor 
Value: false Type: Boolean Description: = true, if coefficient is to be multiplied with input u 
isCCR 
Value: true Type: Boolean Description: = true, if the factional rate given is assumed to be a continuously compounding rate else the rate will be converted (growing.isCCR) 
flowPort 
Type: FlowPort Description: Used to represent stock and flow connections 


y 
Type: RealOutput Description: Output of current rate of flow 

y1 
Type: RealOutput Description: Output of current rate of flow 

stockInfoInput 
Type: StockInfoInput Description: Input of record with stockrelated information 

u 
Type: RealInput Description: Input of factor with regard to coffeficient 

one 
Type: RealInput Description: Default factor 
parCoefficient 
Type: ConstantConverter Description: Constant coefficient (optional) 


actualCoefficient 
Type: Product_2 Description: Inputs are multiplied 

absoluteSensor1 
Type: AbsoluteSensor Description: Reports basic stock–related information 

exponentiallyChanging 
Type: ExponentialChange Description: Exponential growth or decline of connected stock 

fracGrowthRateStock 
Type: Division_Guarded Description: Zero if divided by zero 

fracGrowthRate 
Type: Product_2 Description: Inputs are multiplied 
BusinessSimulation.Examples Causal loop model of world dynamics 
BusinessSimulation.CausalLoop Process driven by elasticity and additional exponential delay 