An emerging and influential literature finds a large and significant decline in macroeconomic volatility since the middle of the 1980's. In this paper, I examine the extent to which the decline in annual and quarterly real output volatility since the onset of this period of Great Moderation can...

Initial estimates of aggregate output and its components are based on very incomplete source data, so they may not fully capture shifts in economic conditions. In particular, if those estimates are based partly on trends in preceding quarters, provisional estimates may overstate activity when...