The Power of Positive Thinking believe and live successfully.” Peale's work came under criticism from various mental health experts, theologians, and academics. One general criticism against Peale's book was the lack of verified sources. "The Power of Positive Thinking" includes many personal anecdotes that the reader has no way of validating. The book includes stories about “a business executive”, “a man, an alcoholic”, “a famous trapeze artist”, “a friend of [Peale’s], a midwestern businessman”, and other unnamed individuals which cannot be verified from the information Peale presents with each anecdote. R. C. Murphy, a prominent psychiatrist based out of Tacoma, Washington, addresses another criticism of
Essays in Positive Economics due to an empirical turn in economics that took place at the end the century, although by 2012 it still commonly served "as a way of avoiding awkward questions concerning simplifications, idealizations, and abstraction in economics rather than responding to them." Essays in Positive Economics Milton Friedman's book Essays in Positive Economics (1953) is a collection of earlier articles by the author with as its lead an original essay "The Methodology of Positive Economics." This essay posits Friedman's famous, but controversial, principle (called the F-Twist by Samuelson) that assumptions need not be "realistic" to serve as scientific hypotheses; they merely