Repeating can be dull and very uninteresting. When choosing your cause and effect topic try not to pick what someone has already done. Most literary scholars will know that your topic has been done before and might be wholly uninterested in reading your essay. Try to do a cause and effect topic that has not been done before but it also not very obscure, or no one will have any knowledge of what you are talking about. If you do pick a topic that has already been done try to change it, approach the topic from a different angle and show a different cause or effect not yet explored. This will help make your essay unique and avoid repeating what has already been done, and thus escape the temptation of plagiarism.