Persuasive writing could be used for commercial and non-commercial purposes. In both the purposes, the message of the writer should gain the attention of the reader. It should also build the interest about the product or service and reduce the resistance of the reader and it should always end up in motivating the action of the reader. The message of the writer could be about buying a product or service. That would be an example of a commercial purpose. A piece of writing can also convince the reader about non-commercial actions. An example of this would be a writing about minding your health and quit smoking. Marketing companies use persuasive writing a lot to convince their target group . Before they start writing their article they do a lot of research about the target group. They try to find a way to reach their target group and a way to convince their target group. The research can make their persuasive writing very effective.
This was great! You’re right, there are sooooo many ways to be persuasive. One thing that I do (when it fits) is to take a subject or idea that I’m attempting to share and dramatize it. Exaggerate it. It helps to get a point across. For example, a friend of mine just wrote a great radio ad for a business that wanted to let everyone know of ALL their many services. Which is no easy feat if you’re trying to stay away from being boring. So, he wrote an ad for the business as if you were ordering their services at a drive-thru fast food joint. This particular concept also would fit into your “Comparison” tip.