Based on a Constant Elasticity Substitution (CES) system, Anderson and van Wincoop (2003) used a Non-linear Least Squares (NLS) model considering the endogeneity of trade costs to refine the theoretical foundations of the gravity model and provide evidence of border effects in trade.
面试官问的面试题： Based on a Constant Elasticity Substitution (CES) system, Anderson and van Wincoop (2003) used a Non-linear Least Squares (NLS)
model considering the endogeneity of trade costs to refine the theoretical foundations of the gravity model and provide evidence of
border effects in trade.
