Manufacturing as a second activity?

Manufacturing as a secondary activity transforms natural resources into more useful and useable forms. Secondary activities involve all processing and manufacturing from the original natural resource through intermediate forms to a final product. Manufacturing accounts for a smaller proportion of the work force than do tertiary activities (service activities), but it contributes billions of dollars to the United States economy as well as goods that consumers want. Although the Northeast has declined in relative importance in terms of manufacturing jobs and output, the region remains significant.