Think if your house as a vessel and your bank account + your next paycheck as constraints.
(P)edals are a function of (V)olume and (T)emperature, volume being every available shelf space in your closet or nooks created by placing your amp diagonally in the corner of a room, temperature being the rate at which your SO notices the rate of change of your collection. Simply put, the pedal collection grows as you make more space to store them and keep your wife from stepping on them.
Pedals typically exist in a state known as "Ideal GAS". The concave boundary in the isometric grid below shows the Ideal GAS Surface which are the points that a consumer's resources change state from liquid asset to pedal.
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