Thanks for your comment. It depends on what you exactly mean by "reasonable evidence", and on the objective of this article. As you should have noticed, this article is part of a series called "Financial Seeds", which I have been publishing for some months and which is intended to be a set of summary study guides for my students of Engineering Economics. They use the book I cited as the main book for the course, and the reason why I openly and publicly cite it is because I do not want any credit for what the original authors have written there. As a summary guide, I do not necessarily have to invent exercises and problems to illustrate concepts (sometimes I do it; sometimes I do not), because they are already in the book, and many other professors do the same. But what I do have to do is to try to make my students understand as much as possible the underlying concepts, based upon a re-arrangement of the original information, information complements, and detailed explanations. And that is precisely my contribution here. Concepts such as the capitalized cost (costo capitalizado) are well known and have been in the literature for a long time. In addition, the solution I present in my article for Example 11.1 is much more detailed than the one presented in the book. With regards to Example 11.2, the book does not present its solution, because it is a proposed problem, which I solve in its entirety to strengthen the procedure in my student's minds (another contribution); and the same can be said for Example 11.3: it is a proposed problem in the book (not solved there) which I solved for my students (another contribution). I will take care of what you suggested, but let me know if arbitrary decisions will be made in the future, because if that is the case, I will stop using your platform and instruct my students to do the same. Best regards.