Quote from TraDaToR:
During the settlement window, price oscillated between 16890 and 16700( if I'm right ), but most volume was done near the high so I didn't make the calc but 16825 seems a reasonable volume weighted average.
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Quote from Blotto:
Certain large interests influence the settlement price by transacting a high volume of contracts during the last minutes of trading to influence the VWAP calculation used by the exchange.
From time to time a hapless broker is caught doing this and banned, however the large interests are not named, punished, or otherwise deterred from this "illegal" market manipulation.
Large interests may also collude to fix the settlement prices.
The regulators are toothless and the real traders understand why and how this so called manipulation takes place.
Exhibit A: http://www.fsa.gov.uk/pubs/final/andrew_kerr.pdf
The mechanism for determining the settlement price can be discovered by reference to the exchange rules.