An intern's desk.
An intern's desk. - 

As the second half of 2014 gets underway, a look at the S&P 500 index. Plus, with the number of jobs recovering since the Great Recession, a look at why office space doesn't tend to increase at the same rate. Also, is the "sharing economy" all it's cracked up to be? With big money flowing through businesses like Airbnb and Lyft, not everyone is on as equal a playing field as promised.

Follow David Brancaccio at @DavidBrancaccio