The amount of trade that takes place within the scope of such agreements is about 35%, which accounts to more than one-third of the trade in the world. The main objective of these agreements is to reduce trade barriers among those nations concerned, but the structure may vary from one agreement to another. The removal of the trade barriers or liberalization of many economies has had multiple impacts, in some cases increasing Gross domestic product (GDP), but also resulting in greater global inequality, concentration of wealth and an increasing frequency and intensity of economic crises.