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Within weeks after taking charge of a public company that had even managed to turn a slight profit , WITHOUT MAKING ANY IMPROVEMENTS WHATSOEVER IN THE WATER SYSTEM , Bechtel doubled and tripled water rates , charging the poor of the city $ 15 or more a month just to keep their water running ... in a city where families live on less than $ 60 per month .
 company: artifact; Bechtel: buyer
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: transfer ownership 
  Option: artifact, seller, place, beneficiary, buyer 
Text: {0} 
Answer:
 company: artifact; Bechtel: buyer