Hi, I am investigating the effect of a commodity price on conflict. I have created a grid of cells with georeferenced data. I am using xtreg in Stata 16.1 have set Stata to xtset cell year and I am using cell FE, year FE and state-year FE. My independent variable is deaths.

To investigate the possible effect of a policy, I have created an interaction term: log(price) * commodity dummy * post-2010 dummy
where post-2010 is a dummy for if the year is after 2010.

My question I still need to include the term "log(price) * post-2010 dummy" or is the perfectly captured by the year FE?