Historically, the theory of forecasting that underpinned actual practice in economics has been based on two key assumptions -- that the model was a good representation of the economy and that the structure of the economy would remain relatively unchanged. In reality, forecast models are...

Economies evolve and are subject to sudden shifts precipitated by legislative changes, economic policy, major discoveries, and political turmoil. Macroeconometric models are a very imperfect tool for forecasting this highly complicated and changing process. Ignoring these factors leads to a wide...