This paper examines the optimal monopoly regulation without transfer based on Basso, Figueroa and Vásquez (Rand J Econ 48(3):557–578, 2017), which compare the quantity-based and price-based instruments to regulate a monopoly that has better information concerning its market demand than the regulator. The optimal screening mechanisms, which offer multiple menus of contracts for the regulated firm to select, and pooling mechanisms, which only provide a uniform contract, are characterized for each instrument. Furthermore, the corresponding perfo...