All in: Investors' cash levels hit record low

Traders work on the floor of the New York Stock Exchange.
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It's hard to poke holes in this bull market.

The usual bear arguments trotted out—a Fed rate increase, slowing China economic growth, an increasing dollar—just don't seem to stick as the bull market continues marching higher.

However, one worrying contrarian statistic highlighted by is making the rounds on trading floors and seems like a legitimate concern given its historical track record.

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