Synthesized answer
The provided passages do not explicitly state the central thesis of "The Theory of Business Enterprise." The text is identified as being by Thorstein Veblen and has 228 pages [1]. However, the content necessary to discern the book's core argument is missing.
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