Which of the following is not a feature common to all forecasting models?
a) This period's forecast error is needed to compute next period's forecast.
b) Forecasts are rarely perfect.
c) Forecasts are more accurate for groups of items rather than for individual items.
d) Forecasts are more accurate for shorter rather than for longer time horizons.
e) All of the answer choices are correct.
Answer: a) This period's forecast error is needed to compute next period's forecast.