When Fortune first (published) its list of the largest companies in America in 1995,Wal-Mart didn’t even exist.That year General Motors was America’s biggest company,and in every year that followed,either GM or another mighty industrial,Exxon was NO.1.Wal-Mart’s (achievement )caps a bigger economic shift -- from producing goods to providing services.Manufacturing’s share of U.S.employment (peaked) in 1953,at 35%.It has been declining steadily since.In the decade that will end in 2010,the Bureau of Labor (Statistics )figures that goods-producing industries will create 1.3 million new jobs,compared to 20 million for service (industries).To look at it another way,today there are about four times as many people working in service jobs as in other kinds of jobs.And even within (manufacturing),services are an increasingly large share of operations.