Given the title of this blog, I would be remiss in not recognizing the anniversary of Irving Fisher's birth. Irving Fisher was an economist in the early part of the 20th century, one of the preeminent economists of his day.
He is perhaps most famous for thre things: first the equation M x V = P x T (or sometimes P x Y or P x Q, as in the title of this blog). This equation basically related the money supply to the price level and became the basis for monetary economics.
The second thing he is famous for is, to say the least, unfortunate. In the days before the stock market crash of 1929, he was quoted as saying the market had reached a permanent plateau. He would lose much in the ensuing crash.
The third thing he did, he is often not connected with. Those of us of a certain age can remember a card filing system called a Rolodex. Fisher was the inventor.
You can find interesting biographies of Irving Fisher here and here. I also recommend Irving Fisher: A Biography. I'm adding it to my carousel at left.
Feel free to comment.