Table 1.

Examples of relationships between interventions impacting drug supply chain and the mathematical model parameters

Relationship between government interventions and model components
Government intervention	Model component
Investment in prevention such as immunization programs	Population demand (D(t))
Building of new roads and highways, installation of railroads	Transportation time (τ)
Hiring of more personnel	Shipment periodicity (n)
Usage of higher capacity vehicles such as trains	Shipment size (A and B)

In some cases, one intervention can impact multiple model components