A widely used index of economic activity is the Chicago Fed National Activity Index (CFNAI). The index is released monthly and is a weighted average of 85 indicators of economic activity. Since the index is calculated using monthly data it can be used as a leading indicator for quarterly GDP. The foll0wing chart shows the CFNAI since 1967 with recessions in red.

A zero value for the 3 month CFNAI indicates that the economy is expanding at rate of growth that is consistent with its historical trend. An index reading below -0.70 following a period of expansion indicates that a recession may have started. A reading above 0.70 two years into an economic expansion indicates increased probability that a sustained inflationary period has begun.

The 3 month CFNAI crossed below -0.70 in December of 2007 and is therefore the likely start date of the current recession. According to the NBER, since 1967 there have been6 recessions. The longest recessions lasted 16 months and occurred from November 1973 to March 1975 and July 1981 to November 1982. The shortest recession started in January 1980 and ended in July 1980, for a total of 6 months. The average recession lasted for 10.8 months.

Using the NBER figures and a start date of December 2007, the following recession window can be interpolated:

Recession Start Date: December 2007 | Possible Recession End Dates |

Long Recession: 16 months | April 2009 |

Short Recession: 6 months | May 2008 |

Average Recession: 10.8 months | mid-November 2008 |

From this table it is clear that the US will not experience a short recession since that would have been completed in May of 2008. The most recent advance GDP report of -0.3% suggests that the recession may not end in mid-November 2008. The only end date left is a long recession with a potential end date of April 2009.

The start date of the recession is consistent with Federal Reserve models of the probability of recession. In a 2006 report, Jonathan Wright a Fed researcher, developed a model for predicting the probability of a recession using the Treasury yield curve. The model developed used the 10 year - 3 month spread and the effective fed funds rate. The following chart is from Wright's paper and shows the probability of a recession since 1964 using his Model B. (Recessions in red)

Using Model B and current data yields the following results from 1997-2008.

This graph illustrates that the probability of a recession in the next 12 months reached the critical level of 50% in the first quarter of 2007. Within 12 months, the 3 month CFNAI crossed below -0.70 indicating a recession has begun. This provides more support for December 2007 as the start date for the current recession.

With this series it appears that 40% probability is the critical level in predicting a decline in GDP in the next quarter. Interestingly, the probabilities breached the 40% level in the first quarter of 2008. While not an exact match with Wright's Model B or the CFNAI data it is fairly close and can serve as additional evidence that the current recession began near the end of 2007 and the beginning of 2008.

After falling below 40% for one quarter, the Anxious Index breached the 40% probability mark again in the 3rd quarter of 2008. This suggests that forecasters are expecting a decline in GDP for at least one more quarter. This projection means that the recession will last until March 2009 which is consistent with the long recession projection of April 2009.

The next CFNAI report will be released on November 24th and could provide clues as to the duration of the economic malaise. As well, watching the 10 year - 3 month spread and effective rates will be of utmost importance.

Disclosure: I have no direct positions in any securities mentioned.

The Federal Reserve Bank of Philadelphia also publishes the probabilities of a recession in its Survey of Professional Forecasters (SPF) report. This data goes back to 1968 and shows the probability of a recession occurring in the next quarter. (Recession in red)

With this series it appears that 40% probability is the critical level in predicting a decline in GDP in the next quarter. Interestingly, the probabilities breached the 40% level in the first quarter of 2008. While not an exact match with Wright's Model B or the CFNAI data it is fairly close and can serve as additional evidence that the current recession began near the end of 2007 and the beginning of 2008.

After falling below 40% for one quarter, the Anxious Index breached the 40% probability mark again in the 3rd quarter of 2008. This suggests that forecasters are expecting a decline in GDP for at least one more quarter. This projection means that the recession will last until March 2009 which is consistent with the long recession projection of April 2009.

The next CFNAI report will be released on November 24th and could provide clues as to the duration of the economic malaise. As well, watching the 10 year - 3 month spread and effective rates will be of utmost importance.

Disclosure: I have no direct positions in any securities mentioned.

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