"If tomorrow the copper price went up to $10,000 or fell to $2000 do you think it would not affect the spare price? "
Scanspeak yes I beleive you are correct both those price ranges would significantly affect the current CDU S/P - however the copper price is now range bound and has only moved 10% from low to high in the last 6 months and as such has no noticable bearing on the current day today CDU S/p fluctuations ( IMO ) also the AUD / USD is almost back to 96c so the exchange rate is also going the wrong way after dipping briefly below 90c a few months back.
CDU Price at posting:
$2.15 Sentiment: None Disclosure: Held