http://wenku.baidu.com/view/30657ed8ce2f0066f5332262.html
http://wenku.baidu.com/view/30657ed8ce2f0066f5332262.html
eft: when price deviates from value, arbitrage happens: someone like buffet will step in to do the counter trade, these are all "subjective", and very ofton there is no buyer or seller left or step in as etf proposes!