What is the Culprit(s) for Recent Equity Weakness?

Just when everyone thought we had COVID-19 whipped, the delta variant came along and US cases inflected higher. The 7-day moving average was about 13,000 in early July and has jumped about 10-fold to 132,000 as of yesterday.

The first place this can be seen is in air travelers. Daily travelers hit about 2.2 million in early July and held there for the better part of the month. In the past two weeks, daily travelers have fallen by about 500,000 people per day.

In the financial markets we can see the chronological overlay. In the chart below, I show the S&P 500 Index overlaid on US investment grade (IG) spreads. IG spreads troughed on July 2, 2020 and have since backed up by 10bps. They compressed in the back half of July, but have begun another rise. Given the tight cross-asset relationship, this could suggest a reset of the S&P 500 lower by about 300 points. If IG spreads break below the mid-July level, this would be a huge red flag.