The JPMorgan Ultra-Short Income ETF ha s pulled in more than $3.5 billion of new money this year. AllianceBernstein launched its first ETFs last Wednesday, including the AB Ultra Short Income ETF , a fund that invests in debt with less than one year to maturity. An inverted yield curve refers to short-term yields that are higher than longer-dated yields. The combination of quickly rising interest rates and an inverted yield curve creates a couple of benefits for short-duration funds. AllianceBernstein's municipal ETF has a management fee of 0.27%, while the fee on the ultra short income fund stands at 0.25%.

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