The labor force participation rate fell to 63.3 percent in March. This is the lowest level since 1979. Many are quick to attribute this falling rate due to workers leaving the labor force because they're so discouraged by the poor job market. But this is only a small part of the story. UBS's Drew Matus argues that this dropping participation rate is largely due to shifting American population dynamics.  Specifically, we're running out of workers. Matus is re-circulating a report he published in January. ...In 2012 the participation rate declined from 64.1% to 63.7%. This decline was the result of a decline in ... (full story)