There are a thousand different jobs, that we all see being done every day: our own, in our office, whether we're managers or firm owners, the work of shopkeepers, that of industrial workers, drivers, singers, actors… But behind, and below, this mass of work moving our economy forward, there's another, just as vast and most of all just as important, as it makes it possible for all the other jobs we just named to be started every morning quickly, efficiently, simply