ETFs track the index that they trade in. This means that when the stocks of ETFs are in demand, their value increases and vice versa. In most of the cases, the value of the ETFs is closer to their Net Asset Value (NAV). Even if the underlying assets increase in value on the stock indices, it is the demand of the ETF stocks that drive the prices, higher or lower.
The trading style keeps a check on the ETF prices from deviating too much from the NAV. When a trader holds an ETF stocks for more profits, another one can step in and trade. So, the value does not change much from the NAV as many traders look for small margins and thus, keep trading.
Most of the brokers or sponsors have sites, where the ETF prices are featured. The ETF prices are displayed just like the stock prices. Thus, a stock trader will find no difficulty in reading the ETF prices and interpreting the various denotations.
Constant monitoring of real time websites enables a trader to follow the ETF prices and trade in profitable situations. Following the ETF prices, one can define stop-losses and trail stops. Following ETF prices for a larger time frame gives a clear indication of how the ETF performs in long term along with their behavioral patterns at different times.
Just as it is done for all other financial investments, it is important to continue studying trends and factors that affect the ETF price. A trader must be vigilant before and during trading time. Factors like climatic changes and global trends help to control the prices to a large extent. The growing penchant towards alternate energy and natural gas is an indication that leaving out such related ETFs would be a mistake.
To project the prices, the global preference or the preference of the people in the capacity of trading ETFs should be studied keenly. Investing in ETF that have lesser demanded assets might affect the bottom-line significantly.