Is More Objective Reality Really Something More?

Descartes' First Cosmological Argument for God's existence depends on a Causal Adequacy Principle for Ideas: an idea that has a certain degree of objective reality must have a cause with at least as much formal reality. This principle is supposed to follow from a Causal Principle of Sufficient Reason. The derivation is unsound: more objective reality may not, for all Descartes says, really be something more, and hence it may not need any special sort of cause. I set this objection in the context of measurement theory. I argue that there are two ways for Descartes to avoid the objection. He can provide further materials for justifying his linkage between formal reality and objective reality. Or he can hold that the objective reality of an idea is strictly identical to the formal reality of the things the idea is about
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