W.H. Hutt, in his 1939 book, "The Theory of Idle Resources," opposed Keynes' perspective on idle resources. He argued that workers could become idle because of seasonal employment, lack of demand for their services, or unions pushing wages above levels the market can bear.
A heavyweight in logics, this book is the full employment Keynesians' nightmare. May be too dense at times, but it sure provided good food for thought! Recommended.
"My several critical references to the work of Mr. J.M. Keynes are due to the fact that his General Theory happens to be in the thoughts of all economists today. I have been wisely advised not to touch on any of the major controversies which his contribution has aroused. Certainly I have not avoided controversial topics. But it is my hope that all sides in the current debate on the monetary causes of idleness will find my analysis realistic and useful, and that it will be of some help to them in searching for the origin of their differences." W.H. Hutt Preface