Mellon instead advocated for the retention of a progressive income tax that would serve as an important, but not primary, source of revenue for the federal government. His so-called "scientific taxation" was designed to maximize federal revenue while minimizing the impact on business and industry. The central tenet of Mellon's tax plan was a reduction of the surtax, a progressive tax that affected only high-income earners. Mellon argued that such a reduction would minimize tax avoidance and would not affect federal revenue because it would lead to greater economic growth. He hoped that tax reform would encourage high earners to move their savings from tax-exempt state and municipal bonds to taxable, higher yield industrial stocks. Though much of the tax plan that he proposed had been developed by former Wilson administration officials Russell Cornell Leffingwell and Seymour Parker Gilbert, the press generally referred to it as the "Mellon Plan".