Crops Worth Much More?

Feudal lords in a lot of europe, thoughout the mediaeval period, have fairly little incentive to invest in or improve their lands. If you mak like, a region more agriculturally productive, it looks more enticing for your rivals to attack and try to take. The money that you invest in improving that land is less money that you're spending on your military. There's not a point in massively increasing your yields or improving the land because they can change your rent at will. Um, when enterprising irishmen try to make a life for themselves in other ways besides farming, the crown cracks down on their ambitions. And there's no way out for the ir