How much did a pound of sugar cost in the Middle Ages?
The record: 1s 6d, 1390s.
About $220 in today's gold
9 days of a farm labourer's pay.
From the Earl of Derby's household accounts. Source
Who could buy it
The lowest paid on each ladder of 1350 whose pay was enough:
In other words, a real purchase: weeks of work for a farm labourer.