Answer:
In England, a rather confusing law called the Assize of Bread and Ale regulated the price of bread at one farthing per loaf. The law had a provision making the size of the loaf dependent on the price of wheat, so that as the price of wheat went up, the bakers could make the loaves smaller to compensate. A note in the Fordham University online Medieval Sourcebook refers to the cost of a day's supply of bread for three men with four servants as being four pence in 1331.
The wages of bakers were not represented in the Sourcebook or other references I could find. It would probably be safe to assume they were paid about as well as servants, or better if self employed. This is hard to track because servants typically got room and food as part of their deal. I would assume, based on what I am seeing, that bakers earned anywhere a half penny to two or three pence per day, depending on circumstances.
Please see the links below.