Predictable ISM Surprise

The ISM Manufacturing PMI in the US fell to 54.1 in December, the weakest since November 2016, from 59.3 in November and missing market expectations of 57.9. It was the largest monthly drop since October 2008 as growth in new orders, production and employment slowed sharply. Business Confidence in the United States is reported by Institute for Supply Management.

https://tradingeconomics.com/united-states/business-confidence

Regional Fed Surveys were already beginning to show collapse.

https://www.zerohedge.com/news/2018-12-26/us-economy-snaps-richmond-fed-plummets-most-record
https://www.zerohedge.com/news/2018-12-31/trump-bump-dumped-dallas-fed-survey-collapses-most-2008-hope-crashes

Also, please see great point from Julian Brigden below.

Julian Brigden is the Co-Founder of Macro Intelligence 2 Partners an independent research firm that provides insight into global markets and policy developments

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