With more than 25,000 Macomb County workers at Fiat Chrysler Automotive, General Motors and the Ford Motor Company, the auto industry is the wheel that spins the local economy.And thanks to the foresight of Sergio Marchionne and Dennis Williams that economic wheel will keep turning.Marchionne, CEO of Fiat Chrysler, and Williams, president of the United Auto Workers, have agreed to move car production to Mexico while investing $5.