as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
do query services like google finance and yahoo finance go back to correct busted and adjusted trades?
user
no. busts are very infrequent, and if an equity were illiquid enough to be affected, the bust cost would be enormous. for a liquid equity, the amount of busted volume is insignificant except during a flash crash or flash spike.  then it would be reasonable to redownload.
assistant