The following is one plausible conception of intrinsic value: A state of affairs is intrinsically good, if and only if, it involves a subject, an attitude, and an intentional object, such that the attitude born by the subject fits the object to which it is directed. This leaves open what fit consists in. On an internal conception of fit, whether an attitude fits its object is wholly determined by the intrinsic properties of the subject, attitude, and the object. On an external conception, this is not so.
On my view, an external conception is right, which has the consequence that the intrinsic value of a state of affair can depend upon facts external to it. Thus, intrinsic properties need not be shared between duplicates (under certain ways of cashing out a duplicate), and intrinsic properties cannot fully be explained by appealing to facts about, say, fundamental features, parts, and their arrangements. Towards defending an external conception of fit, and towards making plausible the idea that intrinsic properties can depend upon external facts, I rely on an analogy with causal laws. Whether a thing exists can depend upon causal laws (say, conservation laws), and so, whether something has some intrinsic property P can depend upon the presence of causal laws in the world in which that thing exists. Likewise, whether an attitude is fitting can depend on governing normative laws.
One normative law says something like this: For all X, if X is bad, one ought not desire X as such.
So when someone does desire something bad, for example, the desire does not fit it’s object because a law governing whether an attitude is fitting has been violated.
Another law says something like this: For all S, X, if S is pleased by X, then S’s being pleased by X is intrinsically good only if S deserves to be pleased.
The next step involves generating the relevant laws, perhaps by forming a ramsey-sentence with their statements, and then defining ‘fit’ as the, hopefully, unique relation that is satisfied by these laws. Any thoughts, or worries about this general strategy?