Detailed Instructions: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Q: The idea was first developed by John Maynard Keynes in his book The General Theory of Employment , Interest and Money ( 1936 ) .
A:
The concept was first developed by John Maynard Keynes in his book " The General Theory of Employment , Interest and Money " ( 1936 ) to explain determination of the interest rate by the supply and demand for money .