  By contrast, naturalist views do face a particular difficulty in giving an account of a value that is genuinely unitary.  On the goods approach, for example, the claim must be that there is one good that is genuinely singular, not a composite of other goods. So for example, a monist hedonist must claim that pleasure really is just one thing. Pleasure is a concept we use to refer to something we take to be in the natural world, and conceptual analysis may or may not confirm that pleasure really is one thing. Perhaps, for example,  we refer both to intellectual and sensual experiences as pleasure. Or, take another good often suggested by proponents of the goods approach to value, friendship. It seems highly unlikely that there is one thing that we call friendship, even if there are good reasons to use one umbrella concept to refer to all those different things. Many of the plausible candidates for the good seem plausible precisely because they are very broad terms. If a theory is to be properly monist then, it must have an account of the good that is satisfactorily unitary.