Solarpunk

France has such a law and I am in favor of it.

However that would probably not solve the problem at hand. Food production is a lengthy process (month to years) with high capacity utilization and once production has started it cannot be stopped. Therefore you cannot control for sudden fluctuation in supply and demand. The crop yield for potatoes this year was way better than expected leading to surplus in supply.

I am not aware of anyone starving in Germany and shipping those potatoes to countries where that happens would probably not feasible (in other words with the same money you could probably get better help elsewhere).