author is more experienced in the topic and that he has authority to speak about it.
Another way Lewis could have used rhetorical effectiveness in his essay was to include a counterargument.
While reading the essay, the audience is only exposed to one side of the argument, due to the fact that Lewis barely spoke of the opposing side. Lewis discusses more extensively the viewpoint that he holds, which is that tipping is unnecessary, however, including a counterargument would have made his argument stronger and would have enhanced the understanding and acceptance of his view from his audience. When teaching the readers how to build an argument, the author of this book himself states: “In short, it is not enough simply to present your own reasons…to make your case as effective as possible, you must acknowledge and respond to the strongest reasons that challenge your own” (11). By delving into the idea that “people were leaving loose change on the counter to show their gratitude” (21), Lewis could investigate why people might leave tips. Then he could have chosen the strongest argument from the opposing opinion and presented a counterargument. This would aid Lewis in building his argument into one much stronger than his
original.
Finally, another method in which Lewis could build his argument would be to understand and include viewpoints of not just someone tipping, but of those various companies receiving them. Instead of just discussing why and how Starbucks developed tipping, Lewis could have broadened his research and discussed how tipping affects the employees of other companies. Lewis could then use his factual evidences and weaved them into his essay. Having multiple sources of evidence as a rhetorical strategy could strengthen his argument immensely, because audience is more convinced when multiple sources rather than one source of evidence.This makes both the author and argument more reliable.
Lewis is an author of a variety of books as well as an editor of a popular magazine, so his audience might be pretty vast. In order to help his audience understand what his ideas are, Lewis must use well-built arguments to spread his word on an opinion that he supports actively.