What strategy of modern manufacturing is adam smith referring to in this statement? "to take an example, therefore, from a very trifling manufacture . . the trade of the pin-maker. . one man draws out the wire, another straights it, a third cuts it, a fourth points it, a fifth grinds it at the top for receiving the head; to make the head requires two or three distinct operations; to put it on is a peculiar business, to whiten the pins is another; . . the important business of making a pin is, in this manner, divided into about eighteen distinct operations."—adam smith, the wealth of nations