This is not a question about fluctuating exchange rates or anything, it's much simpler: Is there a bulk discount built into the Exchange mechanic?
So far I have always assumed that, even if the RATE changes, every single gem is still worth the same at any given time. Meaning that if (for example) 1 Silver can buy you 1 Gem, then 20 Silver would (at that very moment) buy you 20 gems.
However, I noticed that this is not true, and even did the math just now. Right now, to buy 1 Gem I would have to trade 1.39 Silver. That would mean that to buy 5 Gems, I would have to trade 6.95 Silver. But I don't. 6.95 Silver buys me 7 Gems instead. This means that there is some kind of bulk discount, completely unrelated to the fluctuating rate.
So the question is: Is there any research on this? Maybe a table that lists how this discount works?
Best Answer
The details of the GW2 economy aren't made public, so there is no answer for this. The only way you can probably find out would be that you test it, write the exchange rate down every time and look at the results so long till you get a result which you would consider as clear. You could also make a chart of your data for better visualization. However, there is no definite way to find out except asking ArenaNet, but they never said anything about a bulk discount.