Interesting and difficult sales forecasting problems are common. Will the 1998 Volkswagen Beetle be a success? Will the Philadelphia Convention Hall be profitable? How will our major competitors respond if we raise the price of our product by 10 per cent? What if we cut advertising by 20 per cent?

The paper develops a model for forecasting inflation in France. As this model has to be integrated in the Eurosystem projection exercises, the projections are conditional to specific assumptions and must be consistent with the Macroeconomic projection exercise of the Banque de France. The...