Can you tell us a bit about the “late mediÃ¦val agrarian crisis”? It sounds scary.
Caused at least in a great part by the Black Death in the 1350s. The sudden dramatic population decrease led to a collapse in the demand for grain and in the supply of farm labour. So it became expensive to produce grain at the same time as grain became cheap. This led to the abandonment of huge tracts of peripheral farmland.