Now the Federal Reserve has effectively cut the target lending rate to zero, it only has one more weapon in its arsenal. Quantitative easing. Senior Editor Paddy Hirsch explains what this "nuclear option" it is, and what the Fed hopes it'll do.

Hedge funds used to occupy a dark, undisturbed corner of the financial world, but over the last year they've been thrown under the spotlight. Still, many people don't know exactly what hedge funds are, or what hedging actually means. Senior Editor Paddy Hirsch explains.

Leveraging — or borrowing — has been cited as one of the contributors to the financial crisis. Senior Editor Paddy Hirsch explains how the move to deleverage — or reduce debt — is prompting wild market swings and concerns about deflation

Mortgages aren't the only financial instruments that get turned into securities. Marketplace Senior Editor Paddy Hirsch explains how companies make money by buying credit card debt and bundling it.

Marketplace Senior Editor Paddy Hirsch explains how banks have gotten frozen in their tracks, awaiting a rescue.

When the analysts and experts talk about the current financial crisis, they often refer to "credit default swaps." So, what exactly is a credit default swap? Marketplace Senior Editor Paddy Hirsch goes to the whiteboard for this explanation.

Marketplace Senior Editor Paddy Hirsch gives a bubbly explanation of the intricacies of "collateralized debt obligations" — those financial instruments that got us into this financial mess.