American Eagle’s Sydney Sweeney campaign didn’t just add $200 million to the company’s market cap overnight. It reminded us that everything and nothing has changed about marketing. It turns out sex still sells. It always has and apparently always will. Nothing fancy about this strategy. That’s the lesson–or is it?

American Eagle shares have soared following the release of Sydney Sweeney's jeans advert - despite a furious backlash on social media. The brand posted the ad last week as part of its autumn advertising rollout,