Playfair

"William Playfair is best known as an ingenious Scot of questionable repute who happened to invent "statistical graphics"—the line, bar, and pie charts we use today. Some are also aware he developed theories explaining international trade and investment, made contributions to concepts like price indexes and measures of national power, and pioneered strategic analysis. Yet even those familiar with his work will be surprised to learn that Playfair was, in fact, a secret agent, carrying out espionage and subversion against France on behalf of Great Britain. Many of his contributions to economics…