Comment by thyrsus

The left hand scale is presumably dollars per ounce of silver. The right hand side is "margin requirement ($)". I can think of two interpretations of that, neither of which make sense to me. The first interpretation is that one recently needs a $25000 margin per $90 ounce of silver instrument - obviously absurd. The other interpretation is that once you have a $25000 margin you can buy unlimited silver instruments, which is only barely less absurd. How does reality work?