Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/banking-and-money/v/banking-16-why-target-rates-vs-money-supply The rationale for targeting interest rates instead of directly having a money supply target. More free lessons at: http://www.khanacademy.org/video?v=yOgGhPIHnlA