▁natural ▁mon opol ies ▁does ▁not ▁mean ▁that ▁these ▁se ctors ▁must ▁be ▁state ▁owned . ▁Govern ments ▁can ▁en act ▁or ▁are ▁armed ▁with ▁anti - tr ust ▁legisl ation ▁and ▁bodies ▁to ▁deal ▁with ▁anti - comp et itive ▁behavior ▁of ▁all ▁companies ▁public ▁or ▁private . ▁ ▁Con cent r ation ▁of ▁wealth : ▁ownership ▁of ▁and ▁prof its ▁from ▁successful ▁enter pr ises ▁tend ▁to ▁be ▁dispers ed ▁and ▁divers ified ▁- part icular ly ▁in ▁v ouch er ▁priv at ization . ▁The ▁avail ability ▁of ▁more ▁invest ment ▁vehicles ▁stim ul ates ▁capital ▁mark ets ▁and ▁prom otes ▁liquid ity ▁and ▁job ▁creation . ▁ ▁Political ▁influence : ▁national ized ▁indust ries ▁are ▁pr one ▁to ▁inter ference ▁from ▁polit icians ▁for ▁political ▁or ▁popul ist ▁reasons . ▁Ex amples ▁include ▁making ▁an ▁industry ▁buy ▁supplies ▁from ▁local ▁produ cers ▁( when ▁that ▁may ▁be ▁more ▁expensive ▁than ▁bu ying ▁from ▁abroad ), ▁forcing ▁an ▁industry ▁to ▁free ze ▁its ▁prices / f ares ▁to ▁satisfy ▁the ▁elect or ate ▁or ▁control ▁infl ation , ▁increasing ▁its ▁staff ing ▁to ▁reduce ▁un emp loyment , ▁or ▁moving ▁its ▁operations ▁to ▁marg inal ▁constitu encies . ▁ ▁Prof its : ▁corpor ations ▁exist ▁to ▁generate ▁prof its ▁for ▁their ▁share hold ers . ▁Private ▁companies ▁make ▁a ▁profit ▁by ▁ent icing ▁consum ers ▁to ▁buy ▁their ▁products ▁in ▁preference ▁to ▁their ▁compet itors ' ▁( or ▁by ▁increasing ▁primary ▁demand ▁for ▁their ▁products , ▁or ▁by ▁reducing ▁costs