The Boll Weevil Versus “King Cotton”
研究了棉铃象甲对美国南方棉花种植的影响，发现微观证据显示其促使棉花种植转型，但宏观指标未显示长期影响，通过计量模拟解释了两者并不矛盾。
The boll weevil's impact on southern agriculture poses a dilemma. Micro-level evidence suggests the weevil triggered a transition out of cotton, but macro-level indicators fail to register much long-term impact. Econometric simulation of boll weevil impact—taking into account the low demand elasticity for southern cotton, differences between states in the timing and levels of infestation, and long-term supply and demand shifts independent of the weevil—shows that the two sets of evidence are not inconsistent.