Brendan McDermid | ReutersThe Dow Jones Industrial Average has been declining for nine straight days, heading for its longest losing streak since February 1978.
The biggest laggard in the 30-stock Dow during this losing streak has been UnitedHealth , which has contributed to more than half of the decline in the price-weighted average over the past eight sessions.
And then there's a rotation going on with investors selling out of the cyclical names in the Dow that initially popped on Trump's reelection.
The Dow, largely comprised of blue-chip consumer discretionary and industrial names, is widely viewed as a proxy for overall economic conditions.
The Dow was first created in the 1890s to model a regular investor's portfolio — a simple average of the prices of all constituents.
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