Instructions: Given a document, find the main entity about whom the author is writing. Write the full name if mentioned in the text. Note that URLs in the text have been replaced with [Link].
Input: Stocks are overpriced  but that may not be a problem   Peter Costa   president of Empire Executions  told CNBC on Tuesday.
"There's a confluence of really good things. There's good earnings  [and] low interest rates  even with the rate hike next week or next month or whenever it is. You've got a really good environment for stocks  " Costa  said on CNBC's "Closing Bell."
This environment also means that stocks are "absolutely" overpriced   Costa  said.
Still   Costa  said  "I don't know if overpriced is an issue anymore."
Output:
Peter Costa