Louisianians understand that deepwater drilling is central to our economy; we know that the jobs provided by this industry go far beyond those on the rigs themselves -- more than twice as many people in oil-related jobs earn their livings on tugboats and supply boats and in shipyards, helipads, catering kitchens and other places on shore. It doesn't take an economist to see what shutting down the rigs for half a year will do to all those jobs and the people who hold them. But President Barack Obama doesn't seem to get it. His administration fails to grasp how Louisiana's economy works or what the six-month halt to exploratory drilling that the White House has ordered will do to people who earn their living from this critical activity. Either that, or his administration is determined to disregard the economic annihilation that its shutdown will cause.