"the loss of higher-paying petroleum positions drained other sectors as oil companies thinned their ranks of contractors and workers spent less at restaurants and shops."   

How many or what percentage of those "lost" jobs were out of state workers commuting to and from Alaska every few weeks. That would be an enlightening number either way, and it would aid in the figuring of how much revenue "leaves the state" and is never spent here each year.  How much of that lost revenue could we reclaim by reinstating the broad-based state income tax?