The Mystery of Banking by Murray N. Rothbard (pg. 153)

Still, despite its relative unimportance, it should be pointed out that Federal Reserve rediscount rate policy has been basically inflationary since 1919. The older view was that the rediscount rate should be at a penalty rate, that is, that the rate should be so high that banks would clearly borrow only when in dire trouble and strive to repay very quickly. The older tradition was that the rediscount rate should be well above the prime rate to top customers of the banks.