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
Fashion, Not Features, Will Drive The Next Smartphone Revolution
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With most smartphones offering similar specifications, the future lies not
in features but in fashion.
3 minutes ago