@article {11544,
	title = {The Interpretation of Instrumental Variables Estimators in Simultaneous Equations Models with an Application to the Demand for Fish},
	journal = {Review of Economic Studies},
	volume = {67, July},
	year = {2000},
	pages = {499-527},
	author = {Guido Imbens and Joshua Angrist and Kathryn Graddy}
}
