what determines how fast currency move?

I was wondering what determines how fast currency moves? Like GDP/JPY for example, why does it move so fast, while other currency like EUR/GBP doesnt? is it interest rates? but AUD has highest interest rate...and chf/jpy move relatively fast too even though its and japans rate are very close...?


Also does the margin needed to hold a lot can tell u which currency move fastest? for example GDP/JPY require most margin to hold...thanks???

In the case of the GBPJPY you have several things to consider. As I understand it to get to the GBPJPY you have to go through several loops. GBPUSD - USDJPY so the rate has this complication to be taken into account.

Whereas with the EURGBP it's simpler. If the Pound and the Euro are both rising against the Dollar there won't be that much difference in the moves. Well not compared to how the Yen will react to moves in USDJPY and/or GBPUSD.

Interest rates, primarily, affect how one currency will move move relative to another. So if the Bank rate in GBP goes up, then you could expect it to rise against the Dollar, or any other pair it's matched with.

Bank rates aren't the only consideration here, but that's the simple answer to this particular question.