Propose a detailed, step-by-step mechanism for the reaction pathway shown below. 
Definitions:
Mature Products
Products that have reached the end of their growth phase in the product life cycle, characterized by stable sales and minimal innovation.
Stable Demand
A market condition where the desire for a product or service remains consistent over a period of time, unaffected by short-term fluctuations.
Collaborative Forecasting
A process where multiple stakeholders, often from different levels of the supply chain, work together to predict future demand or trends.
Forecast Error
The difference between the actual outcome and the predicted outcome, often used in the context of demand forecasting in supply chain and finance.
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