“A. Q. Morton estimates that ‘a gospel represents in papyrus alone a years wages and a New Testament about eight years’ pay of a skilled workman.’ (Penguin Science News, no 43 (Penguin, 1957), p. 24.)”

Source:

Morris, Leon The First Epistle of Paul to the Corinthians: An Introduction and Commentary The Tyndale Press, London, 1958, page 179 or Revised Edition (1985), page 175

Comment by Grantley: Note that this is referring to a skilled workman’s gross wage, not how much he could save in a year.