text: So , bidding should be leisurely when bidders have little to learn from each other ( say , when they 're bidding on a new computer that 's been widely reviewed ) and intense when some bidders are far more expert than others ( say , when they 're bidding on a heart defibrillator for home use ) .
  
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  When bidders don 't have much to teach one another , there 's no need for bidding to be done intensely .