European regulators have asked Googles rivals whether the Internet search engines revised proposals to settle an antitrust case will boost their bargaining power in commercial negotiations, a European Commission document showed. Google has promised to post more prominent links to rival shopping, travel and restaurant sites when a user searches for content, as well as reduce the minimum price advertisers can offer to pay for paid ads. Google is seeking to end a three-year old investigation by the European Commission and avert a fine that could be as high as $5 billion for blocking competitors in search results. Googles first proposal in April was rejected by its competitors, including Microsoft and British price comparison site Foundem.