By Sarah McBride SAN FRANCISCO Tue Feb 11, 2014 8:11am EST (Reuters) – Sluggish growth among young technology firms could bode trouble for the U.S. economy, according to a new report from the Kauffman Foundation. The number of technology firms aged five years or younger – key drivers of job creation – has fallen to below 80,000, down from a high of 113,000 in 2001, according to the report. Today’s levels are roughly on par […]