# Including a variable which is identical for each cross section member

I am doing a static panel analysis: four independent variables, seven cross sections and $T = 13$ years. I want to include a variable (exchange rate) which varies over time but is identical (has the same value) for each of the cross section members.

### Question:

Is it possible to use a variable in the regression which has an identical value sequence for all of the cross section members?

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