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
How Countries And Companies Can Rev Up The Productivity Engine
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Today the world needs productivity growth more than ever. Here's why it
stalled and what leaders can do to jumpstart it.
10 minutes ago