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Will an ETF increase in price if an underlying stock increases in price
The creation mechanism for ETF's ensures that the value of the underlying stocks do not diverge significantly from the Fund's value.  Authorized participants have a strong incentive to arbitrage any pricing differences and create/redeem blocks of stock/etf until the prices are back inline.  Contrary to what was stated in a previous answer, this mechanism lowers the cost of management of ETF's when compared to mutual funds that must access the market on a regular basis when any investors enter/exit the fund. The ETF only needs to create/redeem in a wholesale basis, this allows them to operate with management fees that are much lower than those of a mutual fund.  Expenses Due to the passive nature of indexed strategies, the internal   expenses of most ETFs are considerably lower than those of many mutual   funds. Of the more than 900 available ETFs listed on Morningstar in   2010, those with the lowest expense ratios charged about .10%, while   those with the highest expenses ran about 1.25%. By comparison, the   lowest fund fees range from .01% to more than 10% per year for other   funds. (For more on mutual fund feeds, read Stop Paying High Fees.)