The model is:

lnGDP = lnINVESTMENT + lnX + E

The data consist of a panel of six countries and 19 year periods for each.

All variables are stationary at I(1) and are cointegrated (two pre-requisites for using FMOLS method).

Should I use the lag of investment (as well as the lag of other independent variables in X vector) as instrumental variables to avoid endogeneity?

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