There were three significant impacts of the plague in the UK during the reign of King Stephen (and the Empress Maud if you are a historian...)
1. Lots of people died - tragedy of biblical proportions.
2. Famine due to an absence of people to till the land and bring in the already poor harvest (weather was appalling for a number of years)
3. And this is the big one, assuming you're a survivor....The absence of land workers led to the king relaxing a strict rule that workers could only work for their "lord". Instead they were able to move villages and do extra work for other landowners. Clever landowners reacted by paying slightly more, thus leading to people focusing their efforts on the higher paid jobs. The job market was born.
so....plague...shortage of workers...rates go up.
Bring it on!