Gibson, John; McKenzie, David - Department of Economics, Waikato Management School - 2007
particular variable of interest, X, on a particular outcome, Y. For example, Deininger and
Minten (2002) wish to examine whether … exogenous variation
which can be used to identify the impact of the variable of interest. For example, Olken
(2006) uses GIS … neighbors have done so might just be a consequence of some
unobserved variable that is spatially correlated - such as soil …