Farmers are price-takers not price-makers. The prices they receive are driven by speculation on the commodities markets (even for crops not traded on the market).
Since they can’t control the price they receive for their crop, they are very sensitive to any change in the cost of inputs. Determining how much to spent on inputs is the part of their profitablity they can control. So widespread behavioral change is usually pretty close to immediate.
The survivor one was the best.
I took every history course this professor taught even though I was a science major.
https://en.wikipedia.org/wiki/Alireza_Shapour_Shahbazi
Most of my college professors had very little impact on my life. His classes fundementally changed how I understand the world to this day.