The book is one of the "Dead Hand" series: six books Sinclair wrote on American institutions. The series also includes The Profits of Religion, The Brass Check (journalism), The Goose-step (higher education), The Goslings (elementary and high school education), and Money Writes! (literature). The term "Dead Hand" criticizes Adam Smith's concept that allowing an "invisible hand" of many people's individual self-interests to shape economic relations provides the best result for society as a whole.

Sinclair intended Mammonart to be an alternative "textbook of culture" (p. 384). He says he expected it to soon be used as a textbook in Russian high schools, and hoped that it would be adopted by other European countries after they experienced Socialist revolutions.

In each chapter, Sinclair critiques an artist according to his or her support for the rich and powerful. Most artists do not challenge the status quo and take positions such as 'art for art's sake' or 'art is entertainment.' In Sinclair's view, no matter how beautiful their work, by their passivity such artists perpetuate oppression and inequality.

For example, in the chapter on Shakespeare, entitled "Phosphorence and Decay," Sinclair praises the writer's glorious facility with words; however, this great talent "saved him from thinking." In contrast, Dickens' unique contribution was to "force into aristocratic and exclusive realms of art the revolutionary notion that the poor and degraded are equally as interesting as the rich and respectable."

Mammonart is notable for Sinclair's repeated statement that all art, including his own, is propaganda. The popular distinction between propagandists like Jesus and Tolstoi, and Shakespeare and Goethe, who are "pure and unsullied creative artists ... is purely a class distinction and a class weapon..." (p. 106)

The list of artists discussed is similar, though shorter, to a 1940 list of Great Books. Sinclair also includes writers of lesser importance who were included at the time in the American literary canon.

Artists discussed:

Mammonart was reprinted in paperback in 2003 by Simon Publications, ISBN 0-9725189-7-5.

Mammonart was read by undergraduates in the 1920s.

Mammonart has been mostly ignored by critics. Very few reviews are available from online scholarly databases.

"All art is propaganda. It is universally and inescapably propaganda; sometimes unconsciously, but often deliberately, propaganda." (p. 9)

"Great art is produced when propaganda of vitality and importance is put across with technical competence in terms of the art selected." (p. 10)

On his enjoyment of John Bunyan's Pilgrims Progress, "One does not escape the need of personal morality by espousing proletarian revolution." (p. 112)

• Mammonart at the Internet Archive
• Sinclair's papers for Mammonart are at the Lilly Library, Indiana University, Bloomington, Indiana.