Thanks again Gann. I've adjusted your Zn and Ni charts to account for inflation and its interesting how Zn (and Cu) are still below their 1973 inflation adjusted prices. Yet Ni is at its highest price in real terms since at least 1945. I've just found some data on the USGS wesite which indicates the last time Ni was at this level was 1892! I mean seriously, the PON is in the stratosphere and the air is pretty thin up there.
