This is how much money you make (1% a week constantly over a period of 24 years!*) if you buy when the COMEX gold rapists come in (London PM), and sell when the good, honest guys from the East buy their physical (London AM). Transactions costs will kill your strategy, of course. But still!
BTW, if you did it the other way round (sell PM, buy AM) you would lose 0.67% a week.
*EDIT: That is 24,720,000%, by the way! Tell me there's no Cartel! :lol:
http://gold.approximity.com/since1985/Gold_USD_PMAM.png