Obviously, these choices become harder still in abnormal times, when major global changes occur and central banks follow unconventional policies. But a new, low-cost approach promises to ease the challenge confronting investors in normal and abnormal times alike.
显然，这些选择在反常时期，即发生全球大变局、央行采取非常规措施时，变得更加困难了。但一种新的低成本方法能够减轻投资者在正常和反常时期所面临的挑战。