Synthesized answer
The provided passages do not specify what evidence the author provides in "The Theory of Business Enterprise." The only information given is the title of the book and its page count [1]. Therefore, it is not possible to answer the question about the author's evidence using only these passages.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: The Theory of Business Enterprise by Thorstein Veblen Pages: 228