In fact, that remains to be seen
I don't know about any currency, but value of anything is supported by the utility it provides. In case of Bitcoin it is transactional utility and speculative utility. But only the former refers to a currency aspect of Bitcoin (if that could be somehow tied to "the economy of the country of its origin"). The latter, obviously, has nothing to do with the former. More specifically, it is the volatility of Bitcoin price and its expansion as well as adoption by whole countries and single individuals that make Bitcoin useful for the purpose of speculation. As you can easily see, the real economy is nowhere near that. In short, what you have read in a textbook may be very tangential to real life