In "I Am an African" story, why is technique more likely to be used in a speech than in an essay or book?

Technique is more likely to be used in a speech than in an essay or book because a speech is meant to be delivered orally to an audience, and therefore requires more engaging and persuasive techniques to capture and maintain the audience's attention. Techniques such as repetition, rhetorical questions, emotional appeals, and vivid imagery can be used effectively in a speech to convey the speaker's message and connect with the audience on a deeper level. In contrast, essays and books are typically read silently and at the reader's own pace, allowing for more detailed and complex arguments to be presented in a more structured and formal manner.

The provided context does not contain any information about the "I Am an African" story or the use of technique in speeches, essays, or books. Therefore, I cannot answer this question.