 One concern is raised by Henry Sidgwick (Outlines 247). Hedonism is committed to the idea that one pleasure is better than another because it is more pleasurable. But this sounds like a quantitative relation. If higher pleasures are better than lower pleasures, but not because they involve a greater quantity of pleasure, how can this be squared with hedonism? One answer is that Mill thinks that there are two factors affecting the magnitude of a pleasure: its quantity, as determined by its intensity and duration, and its quality or kind. On this proposal, one pleasure can be greater than another independently of its quantity by virtue of its quality (Sturgeon 2010).