Final answer:
Michelle Miller uses a marketing strategy by highlighting a 20-year product warranty, instilling customer confidence and emphasizing product quality, which is crucial for products sold without direct customer inspection.
Step-by-step explanation:
When Michelle Miller, a sales rep for American Roofing, talks about the 20-year warranty on her product during her sales presentation, she is employing a marketing strategy rather than a selling strategy. A warranty like this serves as a promise of quality and can be a powerful tool in the goods market.
It is particularly useful for companies that sell products through mail-order catalogs or over the web where customers cannot see the actual products, as it encourages people to buy with confidence, knowing they have a guarantee on their purchase.