If people don’t want your currency, then they won’t trade you other things in exchange for it. That means it’s lost its value.
People might not want your currency because *other* people don’t want your currency. For example if your government is hostile to my government and has put sanctions on your government, then none of my citizens will want to buy your currency, because no one here can accept your currency.
Or people might not want your currency because there’s too much of it, it’s too easy to get so no one will give you anything valuable for it. Think about water. Water is useful to drink and do other stuff, but it’s not *valuable* in a monetary sense. I would never sell you my car and accept 10,000 bottles of water as payment because I don’t need 10,000 bottles of water. I can get water anywhere, usually for free.
Money is usually hard to get, you can only get it by giving people stuff that’s valuable. If you could get it really easily, then you wouldn’t have to give up anything of value, and so it itself wouldn’t be valuable.
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