system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: From where did the first bitcoin get its value?
gpt
>I understand money's value is associated with something materialistic like gold or, in the case of the US, given a value based on the strength of the economy.

So why does gold have value?  Why does the economy have value? 

In the end, "value" is an abstract notion that was invented by humans, and essentially means "people want this thing, and will give you other things to get it."   Money has value not because it's backed by anything, but because people *believe* it has value.

So the first bitcoin had value because someone somewhere wanted it, and was willing to trade something else for it.