Apparently one test for a bubble popping is when prices start to go parabolic.
Perhaps I’m simple minded but the trajectory of GLD from 9th July to 3rd December 2009 looks suspiciously like a parabola to me:
The “best-fit” for those five months of data is a second order polynomial (a parabola).
Be interesting to see what happens next?
Disclosure: "No Positions"