It is hard to make a good comparison because the economy was so fundamentally different. Our modern kg of corn could be anywhere from pennies (for animal feed)

It is hard to make a good comparison because the economy was so fundamentally different. Our modern kg of corn could be anywhere from pennies (for animal feed) to several bucks at Whole Foods. Which do you compare against? (In fact, what we call corn is a new world crop, unknown in Europe until the 16th century. The word would have referred to barley or wheat before that.) So not even the most basic foodstuffs were comparable. Wages are a much better basis for comparison. Unskilled, medium-skilled, and high-skilled jobs are pretty comparable now and then.