<Tr> <Td> Theory (show) <Ul> <Li> Comparative advantage </Li> <Li> Competitive advantage </Li> <Li> Heckscher--Ohlin model </Li> <Li> New trade theory </Li> <Li> Economic geography </Li> <Li> Intra-industry trade </Li> <Li> Gravity model of trade </Li> <Li> Ricardian trade theories </Li> <Li> Balassa--Samuelson effect </Li> <Li> Linder hypothesis </Li> <Li> Leontief paradox </Li> <Li> Lerner symmetry theorem </Li> <Li> Terms of trade </Li> </Ul> </Td> </Tr> <Ul> <Li> Comparative advantage </Li> <Li> Competitive advantage </Li> <Li> Heckscher--Ohlin model </Li> <Li> New trade theory </Li> <Li> Economic geography </Li> <Li> Intra-industry trade </Li> <Li> Gravity model of trade </Li> <Li> Ricardian trade theories </Li> <Li> Balassa--Samuelson effect </Li> <Li> Linder hypothesis </Li> <Li> Leontief paradox </Li> <Li> Lerner symmetry theorem </Li> <Li> Terms of trade </Li> </Ul> <Li> Heckscher--Ohlin model </Li> <Li> New trade theory </Li>

Who does protectionism protect what does it protect them from