I C ˜ f g t

{p}

$/unit

Unit inventory holding cost of plant p in time period t

H C ˜ g t

{r}

$/unit

Unit inventory holding cost of distribution center r in time period t

T C ˜ t

{s, p, r}

$/unit

Unit transportation cost for each part of raw material f or product g in time period t

M B C ˜ f

{s}

unit

Maximum procurement capacity of raw material f for supplier s

D ˜ g t

{c}

unit

Demand request for product g from customer c in time period t

M P C ˜ g

{p}

unit

Maximum production capacity of plan p

M T C ˜ g

{p, r}

unit

Maximum output transportation capacity for product g from plant p to retailer r or from retailer r to customer c