The jury is still out.
Investors are slowly waking up to the benefits of bond ETFs.
The case for index investing rests on the index fund's cost advantage and how representative it is of its actively managed peers, not market efficiency.
This ETF takes less credit risk than most of its peers, so it offers a lower yield, but its cost advantage gives it a durable edge.
Finding an index that scores well across these six dimensions can help investors choose among seemingly similar funds.
Taking stock of these funds and the real-world results they have produced so far.