  There is a different account of value that we ought to consider here: the view that value consists in preference or desire satisfaction. On this view, knowledge and pleasure and so on are valuable when they are desired, and if they are not desired anymore they are not valuable anymore. There is no need to appeal to complicated accounts of diminishing marginal utility: it is uncontroversial that we sometimes desire something and sometimes don’t. Thus complexities in choices are explained by complexities in our desires, and it is uncontroversial that our desires are complex.