Final answer:
The Weyerhaeuser's sales forecast method includes several approaches but the particular method they will not use is not specified in the information provided.
Step-by-step explanation:
The method Weyerhaeuser will use to forecast sales includes all of the following except options not explicitly mentioned in the provided context. To forecast sales, Weyerhaeuser may use historical sales data, market analysis, seasonal trends, and perhaps econometric modeling, among other approaches. However, without additional information given, we cannot determine which specific method is not used.
Looking at production in the short run, one might consider the efficiency of operations such as tree cutting for lumber with a two-person crosscut saw as a factor that could impact lumber sales forecast. Furthermore, the efficiency of transporting logs to sawmills where they are processed into boards can affect the cost structure and eventually sales predictions. These production and transportation factors are relevant as they impact the overall supply and demand dynamics within the lumber market.