An economic analysis of three sunscreens with the same ingredients and the same SPF rating showed a huge difference in costs. According to an article in MedPage Today, the cost per application varied by up to 100-fold depending on the type of clothing worn. The three products were compared on a cost-per-use basis. The difference in cost was due to various factors related to the application. The analysis suggests that consumers should consider the real costs of use. The study highlights the importance of comparing prices not only by package, but by effective quantity per application.