In addition to simplicity and liquidity, they offer instant diversification, and they're open to investors with portfolios of any size. (moneysense.ca)
Also, the smaller denominations in which ETFs trade relative to most derivative contracts can provide an accurate risk exposure match for portfolios of any size. (us.spdrs.com)
Pricing at higher unit volume (around 100 units) is in line with other packages intended for portfolios of that size. (rentalutions.com)