Yearly Archives: 2008

Revisions matter. So do levels

The 1.9% SAAR growth rate in 2008Q2 [BEA] is widely viewed as a positive [0]; and the fact that GDP growth remained, in this advance release, above zero is a positive. However, when taken with the annual revision, one sees some interesting aspects. Not only was growth in 2007Q4 negative, albeit slightly; the revisions put 2008Q2 real GDP below what the final estimate for 2008Q1 GDP was: $11692 versus $11701. Future revisions will definitely occur to the 2008Q2 figure, and indeed the figures back to 2006Q1 will be again revised come next July.

Continue reading

Why a lot of people think the CPI is not representative of their experience … and are right. At least partly.

Government statistics, particularly the CPI, have been in the news (e.g., [0]). Following up on my previous posts [1], [2], I want to take a stab at the question posed in the title.

This post focuses on issue separate from the mathematics of the index formulation, and has to do with what the typical weights at any given instant in time should pertain to. Should one use the expenditure weights that pertain to all the households aggregated in the economy? Or should one use the expenditure weights that pertain to the “typical” household? Kokoski (2003) [updated link] summarizes the distinction thus:

In the democratic index, the expenditure pattern of each household counts in equal measure in determining the population index; in essence, it is a case of “one household–one vote”. In the plutocratic case, the contribution of each household’s expenditure pattern is positively related to the total expenditure of that household relative to other households–in essence, “one dollar, one vote”.

Continue reading