The U.S. manufacturing sector comprises businesses that are engaged in the mechanical, physical, or chemical transformation of materials, substances, or components into new products, including sectors such as machinery, textiles, apparel, food production, and chemicals. However, U.S. policy makers have become focused on competing in high-end, or "advanced manufacturing." While no consensus definition of advanced manufacturing exists, it refers generally to the production of scientificallyand technologically-intensive products, in which the economic value derives from inputs of knowledge and design more than it reflects traditional inputs such as labor and materials.