You're so close, amanda3984! You have everything you need in your diagram and analysis!
It comes down to your excellent prephrase - if money exists, then it wouldn't disappear. Here's how we get there another way:
Premise:
Believe Disappear
Conclusion:
Exist
Prephrase - anything that disappears (when you do not believe in it) does not really exist: Disappear
Exist
Contrapositive: If it really exists, then it would not disappear (when you don't believe in it)
This one might be easier to grasp if we diagrammed it as a "nested conditional", like this:
[
Believe Disappear]
Exist
We can read this in plain English this way:
If it is true that a lack of belief is sufficient for something disappearing,then that thing doesn't really exist
The first conditional claim about belief and disappearing is, itself, a sufficient condition, and "doesn't really exist" is the necessary condition. The contrapositve is if something DOES exist, then a lack of belief is NOT sufficient to make something disappear.
Put it another way, with a more holistic approach rather than using a diagram, and it means that when things truly exist, belief in them doesn't matter or change that fact. If belief changes something, that thing isn't real.
Nested conditional statements add a whole layer of complexity and fun to conditional reasoning! Thankfully we don't see too many of them. Let us know if this proved helpful, or if you'd like to get into it some more. We'll be here to help!
Adam M. Tyson
PowerScore LSAT, GRE, ACT and SAT Instructor
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https://twitter.com/LSATadam