Then in the description it states "The French Livre, sou, and denier are equivalent to the pound, shilling and penny (Latin liber, solidus, and denarius)"
Meaning:
pound = livre = liber = L
shilling = sou = solidus = s
pence = denier = denarius = d
So redoing the calculations, a dozen eggs were a quarter day of laborer wages, and more than a full day of wages for a maidservant or swineherd. Still considerably more expensive than the price of eggs today.