"The Modern Idolatry" by Jeffrey Mark, published in 1934, critiques the global financial system, focusing on the concepts of usury and debt. Mark argues that the financial practices of the time, particularly those involving interest and debt, were exploitative and detrimental to society. He challenges the prevailing economic ideologies, describing them as rooted in outdated and harmful principles. The book emphasizes the need for a more equitable and transparent financial system, free from the control of what Mark refers to as "gold idolatry."