Actually, Hbrown does know this. He was just having some fun by trying to figure out when the leverage in SLW will allow it to trade at the same price as silver spot.
For instance, SLW used to trade just below the spot price of silver, then at around $10.00 spot.. SLW's price caught up to the $10.00 went roughly by $1.50 to $2.00 over. At that point it used the spot price in both its advances and declines like a sinosoidal wave rotates around a centre point..falling 1 to 2 dollars and rising 1 to 2 dollars above the spot price in a repreated pattern.
When I posted my post about stocks taking over and leading the silver spot price, this was what I was hinting at. Since my post SLW was trading 3 dollars below spot, now its 1.70 below.
My guess would be between $21.75 dollars ..silver spot...they catch up