阅读理解A
题干：Inrecentyears,railroadshavebeencombiningwitheachother,mergingintosupersystems,causingheightenedconcernsaboutmonopoly.Asrecentlyas1995，thetopfourrailroadsaccountedforunder70percentofthetotalton-milesmovedbyrails.Nextyear,afteraseriesofmergersiscompleted,justfourrailroadswillcontrolwellover90percentofallthefreightmovedbymajorrailcarriers.Supportersofthenewsupersystemsarguethatthesemergerswillallowforsubstantialcostreductionsandbettercoordinatedservice.Anythreatofmonopoly,theyargue,isremovedbyfiercecompetitionfromtrucks.Butmanyshipperscomplainthatforheavybulkcommoditiestravelinglongdistances，suchascoal，chemicals，andgrain’truckingistoocostlyandtherailroadsthereforehavethembythethroat.Thevastconsolidationwithintherailindustrymeansthatmostshippersareservedbyonlyonerailcompany.Railroadstypicallychargesuch“captive”shippers20to30percentmorethantheydowhenanotherrailroadiscompetingforthebusiness.Shipperswhofeeltheyarebeingoverchargedhavetherighttoappealtothefederalgovernment'sSurfaceTransportationBoardforraterelief,buttheprocessisexpensive,timeconsuming,andwillworkonlyintrulyextremecases.Railroadsjustifyratediscriminationagainstcaptiveshippersonthegroundsthatinthelongrunitreduceseveryone'scost.Ifrailroadschargedallcustomersthesameaveragerate，theyargue，shipperswhohavetheoptionofswitchingtotrucksorotherformsoftransportationwoulddoso，leavingremainingcustomerstoshoulderthecostofkeepinguptheline.It'satheorytowhichmanyeconomistssubscribe,butinpracticeitoftenleavesrailroadsinthepositionofdeterminingwhichcompanieswillflourishandwhichwillfail.“Dowereallywantrailroadstobethearbitersofwhowinsandwholosesinthemarketplace?”asksMartinBercovici,aWashingtonlawyerwhofrequentlyrepresentsshippers.Manycaptiveshippersalsoworrytheywillsoonbehitwitharoundofhugerateincreases.Therailroadindustryasawhole,despiteitsbrighteningfortunes，stilldoesnotearnenoughtocoverthecostofthecapitalitmustinvesttokeepupwithitssurgingtraffic.Yetrailroadscontinuetoborrowbillionstoacquireoneanother,withWallStreetcheeringthemon.Considerthe$10.2billionbidbyNorfolkSouthernandCSXtoacquireConrailthisyear.Conrail'snetrailwayoperatingincomein1996wasjust$427million,lessthanhalfofthecarryingcostsofthetransaction.Who'sgoingtopayfortherestofthebill?Manycaptiveshippersfearthattheywill，asNorfolkSouthernandCSXincreasetheirgriponthemarket.
题目：According to those who support mergers，railway monopoly is unlikely because_____.
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