Lawmakers are considering yet another bill to ban insider trading. But the term "insider trading" seems open to interpretation. Senior Producer Paddy Hirsch helps us understand what it is and why it's a big deal.

So Facebook has filed to go public. How exactly does an initial public offering work? Marketplace's Paddy Hirsch explains.

Private equity funds are groups of investors that flip companies for a profit. It’s the technique they use that makes them special, as senior producer Paddy Hirsch explains.

Junk. Not a nice word. And when it comes to bonds, not a particularly accurate word, either. Junk is something useless, right? Well, "junk" bonds are definitely not useless. In fact they're extremely useful. Sometimes. Marketplace Senior Producer Paddy Hirsch explains what a junk bond really is.