There's loads of things to worry about if you are a bear such as valuations, China, US yield curve flattening, economic woes in Europe, the recent collapse in freight rates etc. Here is an apt summary of these views from the pro's:
Things to Worry About as a Bear
Chris Simon’s Strategy On Identifying Market Gaps And Pioneering New
Opportunities
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The proprietor and creator behind BTST Therapy Services (A Better Tomorrow
Starts Today), BLK Swan, Prim and Proper, Selfish Beauty, Simon
Enterprises, and...
5 minutes ago