So I did some cheating and quickly turned all my energy districts into farms and sold all my excess food. Let the game run for a few years and that's the result:
As you can see if you start selling ridiculous amounts each month the food price does plummet quite a bit. Now farms are definitely not more efficient than generators. However the point still stands, that you don't need generators at all. I think in my case if I would have had a split between clerks and farmers the food price wouldn't have crashed that badly. Also I could just sell some alloys... but anyway. I guess the topic of the thread is that farms are
always better than generators which apparently is not true.