November’s not over, but the way things are looking, the only thing rivaling jumps in the stock market this month is the price of the digital currency Bitcoin. The unregulated form of online cash that is resistant to tracking is being explored in Congress. Some are concerned about the ease of using Bitcoin for money laundering. But still the price of a complex string of numbers that make up a single piece of the currency has soared. Timothy Lee is following the currency for The Washington Post, and tells Marketplace Tech host Ben Johnson why one Bitcoin is now trading for over $1,000.