While recent GDP readings have showed inconsistency repeatedly, investors should not ignore GDP readings totally, said IHS chief economist Nariman Behravesh.
But there are at least three different problems with the GDP data series. The first is seasonality; there are huge swings in seasonality – for instance the first-quarter data is almost always underestimated. The government doesn’t seem to know how to deal with the first-quarter GDP data – whether it’s bad weather or something else.
If investors go back in history, the GDP data is always way off, especially the first-quarter reading because of seasonal adjustment problems. Secondly, the Bureau of Labor Statistics allows the inventory numbers to swing the headline GDP reading a lot because inventory numbers are highly volatile. While the GDP reading bounces around, employment readings have been fairly steady.

Institutional investors have been selling or writing put options for many years to boost income when markets are placid and trend sideways.



