Questions: Grounding and the Hierarchy of Fundamental Facts

Question 1

A philosopher says: 'The fact that water is H₂O causes the fact that water is wet.' A grounding theorist would object that this misdescribes the relationship. Why?

• A. Water being H₂O does not actually explain water's wetness — the two facts are unrelated
• B. Causation is a temporal relation between events; grounding is an atemporal in-virtue-of relation between facts — the molecular structure doesn't cause wetness over time, it constitutes its metaphysical basis
• C. The fundamental level contains only physical facts, so chemical facts cannot ground phenomenal ones
• D. Wetness is a fundamental fact and is not grounded in anything

Answer: (B)

Causation and grounding are distinct relations. Causation is temporal: event A brings about event B by preceding it. Grounding is atemporal: fact B holds in virtue of fact A right now, constituting its metaphysical basis rather than producing it over time. The molecular structure of water doesn't cause its wetness by preceding it — the structure is what makes wetness obtain. Conflating these relations mischaracterizes the explanatory structure grounding theory is designed to capture.

Question 2

What does it mean to say the grounding hierarchy is 'well-founded'?

• A. The hierarchy is based on empirical evidence from physics and chemistry
• B. There is a bedrock of fundamental, ungrounded facts at which the chain of 'what grounds what' terminates
• C. Every fact in the hierarchy has exactly one grounding fact beneath it
• D. The hierarchy is organized by causal priority, with earlier events at the bottom

Answer: (B)

Well-foundedness means the grounding hierarchy does not descend forever — there is a bottom level of fundamental facts that are not themselves grounded in anything further. Without well-foundedness, every fact's grounding appeal would point to yet another grounded fact, producing an infinite regress that leaves everything ultimately unexplained. Most metaphysicians assume well-foundedness because an explanatory chain that never bottoms out seems to explain nothing in the end, even if each individual step is valid.

Question 3

Grounding is an asymmetric relation: if A grounds B, then B cannot ground A.

• T. True
• F. False

Answer: True

Asymmetry is a core feature of grounding. The fact that this surface has these reflective properties grounds the fact that it is red — but the redness does not in turn ground the reflective properties. The relation runs in one direction only, from the more fundamental to the less fundamental. Symmetry would collapse the hierarchy into a flat structure with no genuine priority, defeating the point of positing grounding as a metaphysical relation at all. Grounding is designed to capture dependence, and dependence is inherently directional.

Question 4

Grounding is the same relation as logical entailment: whenever the facts at level A logically entail the facts at level B, A grounds B.

• T. True
• F. False

Answer: False

Grounding and logical entailment are distinct. Entailment is a logical relation between propositions: some statements guarantee the truth of others by logical necessity. Grounding is a metaphysical relation between facts in reality: B holds in virtue of A, capturing real-world dependence rather than logical inference. Many entailments are not groundings (mathematical truths entail each other without one grounding the other in the relevant metaphysical sense), and grounding theorists argue the relation must be metaphysically primitive, not reducible to logic or necessity.

Question 5

Why do most metaphysicians assume that the grounding hierarchy is well-founded (terminates at a bedrock), and what would it mean if it were not?

Model answer: Well-foundedness is assumed because an infinite regress of grounding — where every fact is grounded in another, which is grounded in another, with no terminus — seems to leave everything metaphysically unexplained. If there is no bedrock, the chain of 'what grounds what' always passes the explanatory buck: there is no ultimate account of why anything is the way it is. A non-well-founded hierarchy would mean reality has no fundamental level — every layer of explanation bottoms out in yet another layer requiring explanation.

The assumption is contested: some philosophers argue that a non-well-founded but coherent explanatory structure is possible, with each step genuinely informative even without a terminus. The debate concerns whether the purpose of grounding — revealing what reality is fundamentally like — requires a bedrock or merely requires each step in the chain to be genuinely explanatory. For most working metaphysicians, well-foundedness is load-bearing: it is what makes the question 'what is fundamental?' a coherent inquiry with a determinate answer, rather than an infinitely regressing one.