Tonon Ordóñez, L.B., Pinos Luzuriaga, L.G., Albornoz Flores, A.C. and García Flores, P.E. 2019. Income elasticity of bilateral trade through the gravitational model. Case Ecuador. Economy and Politics Journal. 30 (Jul. 2019), 139–156. DOI:https://doi.org/10.25097/rep.n30.2019.06.