posted on 14 October 2016
Written by Steven Hansen
Retail sales were up according to US Census headline data - and at expectations. Our analysis paints a similar picture of retail sales - with the three month rolling averages showing 2.5 % year-over-year growth.
Backward data revisions were slightly up.
Advance Retail Sales Year-over-Year Change - Unadjusted (blue line), Unadjusted with Inflation Adjustment (red line), and 3 Month Rolling Average of Unadjusted (yellow line)
Year-over-Year Change - Unadjusted Retail Sales (blue line) and Inflation Adjusted Retail Sales (red line)
Retail sales per capita seems to be in a long term downtrend (but short term trends vary depending on periods selected - see graph below).
Year-over-Year Change - Per Capita Seasonally Adjusted Retail Sales
From the U.S. Census Bureau press release:
Seasonally Adjusted Retail Sales - All (red line), All except food services (blue line), and All except motor vehicles (green line)
The differences between the headlines and Econintersect are due to different approaches to seasonal adjustment (see caveats at the end of this post). Long and medium term trends always agree comparing the adjusted to the unadjusted data - it is the short term trends and month-over-month change where the conflict occurs.
Comparison of the Year-over-Year Census Seasonally Adjusted Retail Sales (blue line) and Econintersect's Unadjusted Retail Sales (red line)
Declines of short duration often occur in the seasonally adjusted series without a recession resulting.
Retail and Food Services Sales - Seasonally Adjusted
Using employment as a gauge to check growth, employment in retail has been growing - but the rate of growth is slowing.
Retail Employment - Total Seasonally Adjusted (blue line, left axis) and Year-over-Year Change Unadjusted (red line, right axis)
And finally, as retail sales can be a component of determining a recession start date, the zero line of the graph below could be an indicator a recession was underway (or about to begin).
Retail Sales - Recession Watch Graph
Caveats On Advance Retail Sales
This data release is based on estimates. However, the estimates have proven to be fairly accurate although tend to miss at economic turning points. Therefore up to three months are subject to backward revisions, although normally slight, can sometimes be modest.
The data in this series is not inflation adjusted - and Econintersect adjusts using CPI less shelter CUSR0000SA0L2. The St. Louis Fed also inflation adjusts the Census seasonally adjusted data. The last two recessions began as the inflation adjusted retail sales crossed the zero growth line.
Comparison of Real Year-over-Year Growth between FRED's Real Retail Sales (green line) and Econintersect's Inflation Adjusted Retail Sales
As in most US Census reports, Econintersect does not agree with the seasonal adjustment methodology used and provides an alternate analysis. The issue is that the exceptionally large recession and subsequent economic roller coaster has caused data distortions that become exaggerated when the seasonal adjustment methodology uses more than one year's worth of data. Further, Econintersect believes there is a New Normal seasonality. Using data prior to the end of the recession for seasonal analysis could provide the wrong conclusion.
The impact of the monthly retail sales data on GDP is not straight forward. Real GDP (of which the consumer is over 60%) is adjusted for inflation. Further, GDP is an analysis of quarter-over-quarter or year-over-year growth, while retail sales is a monthly data series.
Econintersect determines the month-over-month change by subtracting the current month's year-over-year change from the previous month's year-over-year change. This is the best of the bad options available to determine month-over-month trends - as the preferred methodology would be to use multi-year data (but the New Normal effects and the Great Recession distort historical data).
From Econintersect contributor Doug Short:
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