The US official statisticians have today issued revised statistics for GDP dating all the way back to 1929. It may be alarming for investors and policy makers to hear that our understanding of economic “truth” needs to be amended for the last 84 years, but the changes have not in fact made much fundamental difference to the debates which matter for the economy today.
In particular, there has been very little change in the Fed’s likely view of the amount of slack which remains in the economy, though the latest version of growth in the last few quarters, including the publication of data for 2013 Q2 for the first time, may persuade them that economic momentum is a little firmer than previously believed.
The most dramatic-sounding news in today’s release is that the level of nominal GDP has been revised up by 3.4 per cent in 2013 Q4. This follows a number of methodological changes, the most important of which is to treat R&D spending as a positive contributor to investment and GDP, rather than as an input to the production process. But since this change impacts GDP levels for decades in the past, it does not make much difference to our understanding of the economy’s capacity to grow in the immediate future. It simply involves viewing the same objective truth through a different coloured lens. For most practical purposes, this change can be ignored.
There are, however, three areas where the revisions could be significant: Read more