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Variable | Definition |
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| Inventory cost for raw material per unit |
| Inventory cost for finished products per unit |
| Shortage cost for raw material per unit |
| Shortage cost for finished product per unit |
| Cost of production of raw material per unit |
| Cost of production of finished product per unit |
| Price of the raw material per unit |
| Price of finished product per unit |
| Total profit of the supply chain |
| Profit for the supplier |
| Profit for the manufacturer |
| Planned output of the supplier |
| Ordering quantity by the manufacturer |
X | Random variables by the supplier |
Y | Random variable by the manufacturer |
Z | Random variables of market demand |
D | Expectation of the market demand |
| Probability density function of X |
| Probability density function of Y |
| Probability density function of Z |
| Qualification point of quantity discount |
| Discount rate of the price |
U | Independent and non-coordinated decision |
C | Centralized decision |
QD | Quantity discount decision |
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