E。g。，lumber，coal，paper，woolandcotton，grain，leather，cattleforthepackinghouses。Alltheseandmanyothersaretoanincreasingextentspokenfor，delivered，anddisposedofunderwell-definedstaplegradesastoqualityanddimensions，weightandefficiency。
Wellshowninthecaseofwheatandflour；butthelikeistrueasregardsthestocksofothercommoditiescarriedbyproducers，jobbers，retailers，andconsumers。
Wellillustratedbytheinterdependenceofthevariousbranchesofironandsteelproduction。
Asseen，e。g。，inthedependenceofoilproductionoroilrefiningonthepipelinesandtheirmanagement，orinthedependenceoftheprairiefarmersontherailwaylines，etc。
tmaybenotedinthisconnection，ontheonehand，thatapopulationwhichisinnodegreehabituatedtothemodernindustrialprocessisunabletoadaptitsmodeoflifetotherequirementsofthismethodofsupplyinghumanwants，andsocanderivebutlittlebenefit，andpossiblygreatdiscomfort，fromaforcibleintrusionofthemachineindustry；as，forinstance，manyoftheoutlyingbarbarianpeopleswithwhomtheWesternindustrialcultureisnowenforcingaclosecontact。Ontheotherhand，itisalsotruethateventhemostadequatelytrainedmoderncommunity，amongwhomthemachineindustryisbestathome，doesnotrespondwithfruitlessalacritytothedemandsandopportunitieswhichthissystemholdsout。Theadaptationofhabitsoflifeandofidealsandaspirationstotheexigenciesofthemachineprocessisnotnearlycomplete，nordoestheuntrainedmaninstinctivelyfallintolinewithit。Eventhebest-trained，severelydisciplinedmanoftheindustrialtownshashisseasonsofrecalcitrancy。