Even energy infrastructure master limited partnerships (MLPs) that focus more on "midstream" pipeline and storage companies are hurting.Alerian MLP ( AMLP ) has fallen 20% in the past month and 37% YTD. S harp drops last week in the major market indexes and many ETFs may have more to do with plunging oil prices than the keenly watched Fed move expected Wednesday. "Paying less at the pump might seem like a good thing, but the drop in crude has reinforced fears over slow economic growth and deflation," Koesterich wrote Monday.