UnitedHealth Group's recent stock plunge makes it clearer than ever why we should stop paying so much attention to the Dow.

But what does that mean ... the Dow, S&P 500, and Nasdaq. Several things can prompt a correction including a change in economic policy, newly released jobs or inflation data, and company ...

What kind of influence will Nvidia have on the 30-stock index when it joins before the bell ... Keep in mind that the Dow is a price-weighted index, so a company's market capitalization doesn ...