Ch.4 Market power and dominant firms Chapter 5. Non-linear pricing and price discrimination Ch. 6 Market power and product quality • Search goods • Experience goods and quality • Signaling high quality • Summary
① Lymphocyte: a. T-lymphocytes: cytotoxic T cell: Tc C- kill the tumor cell, virus infective cell and foreign cell helper T cell: Th C- promotes activity of BLC and Tc C suppressor T cell: Ts C –regulate the function of BLC and TC