A growing and vocal minority of economists believes that there will be a double dip recession primarily because of the intransigence of high unemployment and the rapidly faltering housing market. The notion of a "jobless recovery" has been around since the recessions of the 1950s and 1960s. It is a concept built on a relatively simple idea: employment lags during a recession but it is always part of a recovery cycle. Production rises as businesses see the end of a downturn and anticipate improving sales. They are reluctant to hire new workers until the recovery is confirmed, but once it has been, hiring picks up.
This is what a double dip recession would look like: