Final answer:
The necessary data to calculate the total forecasted demand from both distributors for week 9 is not provided. We need the planned order quantities from each distributor to provide an accurate answer.
Step-by-step explanation:
The correct answer to the student's question would require specific data from the planned orders of both distributors for week 9, which is not provided in the text.
The information given discusses the general concept of combining supply and demand shifts to determine equilibrium quantity and price, but it does not contain numerical data or specific forecasted demand figures.
Without this data, we cannot calculate the total forecasted demand that the manufacturer will use for its forecast in week 9.
The correct answer is option B. In week 9, the manufacturer will use the total forecasted demand from both distributors combined for its forecast.
Combining the forecasted demand from two distributors helps the manufacturer get a more accurate and comprehensive picture of the overall demand for its products.
By considering the planned orders from both distributors, the manufacturer can make better decisions regarding production and inventory management.