While it's too soon to tell what the ultimate cost of Equifax's data breach will be, Wall Street has already rendered its initial verdict: $4 billion. That's how much stock market value Equifax has lost...

Ten times the original estimate, for starters.

How can you invest in the e-commerce boom without paying sky-high prices for Amazon stock? Hint: Look at the firms delivering your online purchases.

But does that mean you should invest?

Trump's tax cuts could be on the line.