system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: FAQ Why are rapidly falling or rising exchange rates is a good or bad thing for a countries economy or the global economy?

Lately we've been getting questions about why a countries rapidly declining or rising currency rate is a good or bad thing for both that nation or the global economy. 

What does a strong or weak currency imply about the nation's current or future economy?

How can a nation artificially raise or devalue their currency? What is the short-term and long-term impact of that?

ELI5-Mods: Please keep the answers generic as possible, and not specific to any current events.
gpt
Let's say you are USA and you sell Hot Cheetos for 1$ a bag. France sells Chaude Cheetos for 1€ a bag. It has a different name but basically it's the same bag. Same quantity and everything. If our currency was the same, you'd exchange 1 for 1 and get a bag. But! It isn't. You go to Europe and give them a dollar and they give you .90 Euros. So the same exact bag would cost an American 1.11$. So what France will do is say, ACHETER TOUS LES HOT CHEETOS! And instead of buying 10,000 Chaude Cheetos for 1€ each, they will exchange that same 10,000€ for Dollars, and get 11,050 bags of Hot Cheetos. France spends the same amount of money, but in the US, they get more bang for their buck and would rather bring in Hot Cheetos than buy their domestic Chaude Cheetos.

Whoever has the stronger currency will then buy from other countries and that's how imports and exports are encouraged. If everyone's money was worth the same, then there would be no incentive to buy things from other countries. And if this didn't happen, you would not have a globalized economy that wouldn't benefit from bringing in cheap goods from other countries, as well as getting money from other countries who buy your products.