As the figure shows there is a clear negative correlation between U.S. unemployment and the S&P 500. Currently, we are seeing extreme highs in unemployment and the recovery will certainly take some time.
To see more reasoning for a short position, please look at my previous post on the S&P 500 (Witnessing a bubble created by people's unrealistic expectations)
To see more reasoning for a short position, please look at my previous post on the S&P 500 (Witnessing a bubble created by people's unrealistic expectations)