An Inquiry into the Nature and Causes of the Wealth of Nations influenced a broad range of thinkers from David Ricardo to Karl Marx. Smith stresses the importance of the division of labor to economic progress. Opposing mercantilist monopolism, he offers a theoretical and historical case for free trade. Five editions appeared before his 1790 death: 1776, 1778, 1784, 1786 and 1789. Edwin Cannan's team collated the 1st five. The differences were published with a 6th edition in 1904. They found numerous minor differences between the 1st and 2nd editions, both of which were published in two volumes. Differences between the 2nd and 3rd editions are major. Smith annexed these 1st two editions with the 1784 publication of Additions and Corrections to the 1st and 2nd Editions of Dr Adam Smith’s An Inquiry into the Nature and Causes of the Wealth of Nations. He also published a 3-volume 3rd edition, incorporating Additions and Corrections and the 1st index. Additions and Corrections included entirely new sections. A 4th edition of 1786 had only slight differences from the 3rd. Smith notes in the opening Advertisement, "I have made no alterations of any kind." Cannan notes trivial differences between the 4th and 5th editions— misprints being removed from the 4th, different misprints being introduced.