Her first commissioned book, "Illustrations of Political Economy", was a fictional tutorial intended to help the general public understand the ideas of Adam Smith. "Illustrations" was published in February 1832 in an edition of just 1500 copies, since the publisher assumed it would not sell well. Yet it very quickly became highly successful, and would steadily out-sell the work of Charles Dickens. "Illustrations" was her first work to receive widespread acclaim, and its success served to spread the free-market ideas of Adam Smith and others throughout the British Empire. Martineau then agreed to compose a series of similar monthly stories over a period of two years, the work being hastened by having her brother James also work on the series with her.