Errors in Reasoning Questions - - Question 16

It is more desirable to have some form of socialized medicine than a system of medical care relying on the private se...

gretelzoom April 9, 2020

What is an example of presupposition?

I've seen this answer choice in a number of these error in reasoning questions. I am just unsure of what it actually means. Can you give an example of an argument where the flaw is due to presupposition? Thanks!

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shunhe April 9, 2020

Hi @gretzelzoom,

Presupposition basically occurs in circular arguments, and means you're assuming what you're trying to conclude. For example, consider the following argument:

The Bible says that God exists, and the Bible is infallible, since the Bible is the word of God. Therefore, God exists.

In this argument, we can see that from a strictly logical perspective, the argument relies on the conclusion. The second premise assumes that God exists, which is then used to prove that God exists. But if you just assume it in a premise, and then conclude it, you haven't really shown it from a logical perspective. Does this make sense? Let me know if that helps or not.