(Requires Appendix material)A necessary and sufficient condition to derive the OLS estimator is that the following two conditions hold: 
= 0 and 
= 0.Show that these conditions imply that 
= 0.
Definitions:
Demand Uncertainty
The inability to accurately forecast consumer demand, leading to challenges in supply chain planning and inventory management.
Price Uncertainty
The unpredictability of the cost of goods or services in the future, affecting budgeting and planning.
Warehousing Space
The area available for the storage of goods in a warehouse, crucial for inventory management and logistics.
Supply Chain Design
The process of structuring a supply chain to meet the goals of cost, efficiency, delivery, and flexibility.
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