Long-term investors are not concerned about short-term volatility. That means that market corrections are largely ignored. Long-term ETF holders focus on the big picture. ETFs function similarly to mutual funds since they comprise multiple financial instruments. Given their low expense ratio, it is possible to generate sizeable returns over the long-term. A good way to generate a larger ROI is by keeping ETF costs to a minimum. When investing in ETFs, it's the constituent components that are important. Picking top stocks in a booming sector can prove especially lucrative. Yields of 10% - 20% per annum are considered significant.