Today, Keynesian theorizing does not inspire whispers and giggles from the audience. There are many economists under the age of forty who do not take… - Greg Mankiw

A few years ago, I had the good fortune of running across a first edition of Paul's textbook (not the recent reprint of the original text, but an actual 1948 edition). It was a real find. I bought the volume in an online auction for, if my recollection is correct, $35. Talk about consumer surplus! I would have gladly paid many times that.
At the next Boston Fed meeting, I took the book along to get Paul to sign it. Below is the book's title page, along with Paul's gracious inscription.

Despite its flaws, Peddling Prosperity has much to recommend it. There is no book written for a lay audience that explains the economics profession with more perception or clarity than this one.

To find a substitute for laboratory experiments, economists pay close attention to the natural experiments offered by history.