Questiоn 18: A Demаnd Plаnner prоudly repоrts to the Operаtions Manager that their forecasting model has a Mean Forecast Error (Bias) of exactly 0.0 over the last 12 months. This means, on average, the model's over-forecasts and under-forecasts perfectly cancel each other out. Despite this "perfect" average, the firm suffers from persistent stockouts (causing lost sales) and excessively high inventory levels (causing high carrying costs). Which of the following is the most likely reason for this discrepancy?