After that, the writer first adopts the national economy equilibrium and the econometric methods respectively to estimate the contribution of processing trade in two provinces to the GDP.

• 接着，文章分别采用国民经济恒等式和计量经济学的方法测度了两省加工贸易对GDP的贡献率，并且分析了两省加工贸易效应差异的原因。