... or has the value of currency gone down?

It is an interesting way of looking at things - something that was being dicussed on Russia Today at some point a few days or weeks ago.

Generally, we are told that the value of Gold has doubled or so over a period of time.

Another way of looking at the same information is that you now need twice as much currency to buy the same amount of gold.

So has the value of gold gone up or has the value of currency gone down without us even noticing?