The market is getting nervous about something experts are struggling to define

Right now, people in markets are worried about one big thing: liquidity. But there's a problem: no one is exactly sure how to define or measure it. This week, Peter Hooper and his team at Deutsche Bank wrote a big report dissecting the subject of liquidity and defined it -- or tried to -- as follows: What do we mean by market liquidity? Although there are potentially many different definitions of market liquidity, in its simplest form we think of a liquid market as one in which trades can be exe...