I have a logit model with my dependent variable being "probability of exiting unemployment" and one of my independent variables is "individual duration of unemployment". Obviously there is a huge problem of endogeneity between these two variables, and I have been struggling to think of a possible instrumental variable to use to address this endogeneity issue. Can anyone suggest any possible instrumental variables that may be used, or is the endogeneity problem just too massive between these two variables to be solved?
Advice would be much appreciated!