For two periods an expert E announces his forecast of the state to a decision-maker D who chooses action. They disagree about the precision of the probability assessments. At the end of period 1 the state is observed. In the last period E makes announcements more extreme than his forecasts....

For two periods an expert E announces his forecast of the state to a decision-maker D who chooses action. They disagree about the precision of the probability assessments. At the end of period 1 the state is observed. In the last period E makes announcements more extreme than his forecasts....

The paper reviews the sources of «Upward bias» and «Downward bias» in the USConsumer Price Index (CPI) and discusses the changes the Bureau of Labor Statistics has introduced in order to eliminate them. The remaining biases are quantified. Also, the question is raised how much the changes to...