Define and explain three barriers to trade. What effect do those barriers to trade have on domestic consumer surplus? What is the Riccardo Effect in relation to specialization and exchange? Who benefits from specialization and exchange in terms of domes

Define and explain three barriers to trade. What effect do those barriers to trade have on domestic consumer surplus? What is the  Riccardo Effect in relation to specialization and exchange? Who benefits from specialization and exchange in terms of domestic and international consumer and producers? 

This is a essay questio ( minimum of 5 sentence per paragraph).