The industrial sector was the engine room of the world's biggest economy at the beginning of the 21st century and would continue to be very important. Manufacturing industries contributed only some 11% of overall gross domestic product (GDP) in 2009, and increasingly depended on inputs from the industrial sector (Euro Monitor, 2011).
US statisticians have compiled a classification of economic activities that attempt to reflect the blurring of the boundaries between the major economic sectors. Unemployment created a main problem in an effort to increase productivity. Unemployment has doubled and remains stubbornly high, despite ...