1/28/2004
slide
12
William Playfair
•
Price of wheat, time (16
th
,17
th
, 18
th
centuries) and reigns
of British kings and queens.
•
Line along bottom shows price of labor—and how wheat
has never been so cheap compared with that price
http://www.math.yorku.ca/SCS/Gallery/images/playfair-wheat1.gif
