You're comparing the average medieval laborer, who was pretty solidly middle class, to a modern laborer, who is at best working class if not working poor. As another poster points out, a strong, healthy 18-20 year old male trained in a skill is a lot more useful in 1350 than the same person with the same training/education.
Back then people died younger due to war or disease. Starting in 1350 the black death killed around a third of the population of England. I would say almost certainly the average labourer of the 14th century would have had much more power and influence than the average labourer would today.
I did do a google search though. This link from the economist is quite interesting and cites numerous studies.
http://www.economist.com/blogs/freeexchange/2013/10/economic...