Explanation:

- The book "Trained Economic Politique" is not commonly associated with any of the listed economists in well-known economic literature.

- Option 1: Pigour – There is no prominent economist by the name of Pigour who wrote this book.

- Option 2: J.B. Say – J.B. Say was a classical economist known for "Say’s Law," but he did not write "Trained Economic Politique."

- Option 3: Keynes – John Maynard Keynes was a famous British economist best known for "The General Theory of Employment, Interest and Money."

- Option 4: Ricardo – David Ricardo was a classical economist known for his work on comparative advantage and "Principles of Political Economy and Taxation."

- The correct answer is Option 2: J.B. Say. He wrote the book “Traite d’Economie Politique” (French for "A Treatise on Political Economy").

Correct Answer: Option 2: J.B. Say