Liberalism is about laissez faire, free markets, and greed.
Economic nationalism is about states, state power, and security. Structuralism is about how capitalism pushes states and markets into class warfare. Each of these over-simplifications contains a kernel of truth, but much is lost in the process of simplifying, too. As Einstein said, it is important to make things as simple as possible, but no simpler. An important intellectual initiative within IPE is the movement to expand the field and make it more inclusive of different ideas and to keep it from being over-simplified.