Full Idea
To say that a reaction requires the earlier presence of an action just raises anew the question of why it is 'required' if it isn't bring about the reaction.
Gist of Idea
Why does an effect require a prior event if the prior event isn't a cause?
Source
Adrian Bardon (Brief History of the Philosophy of Time [2013], 4 'Pervasive')
Book Reference
Bardon,Adrian: 'Brief History of the Philosophy of Time' [OUP 2013], p.99
A Reaction
This is another example of my demand that empiricists don't just describe and report conjunctions and patterns, but make some effort to explain them.