Its actually known that Poe uses the word nevermore because "loss will always be part of life" meaning that we cannot hold onto something we have or who we love. a way of saying we can't hold on.
He used nevermore instead of another word because, nevermore signifies that you don't plan on it happening even over your dead body while other words are common and over used
I would go for the first one. If the euro decreases in value, that would mean it's cheaper to buy more of. The economy as a whole in Europe would decline with the currency they use. Things would be cheaper.
