Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

(Credit: David Medeiros) "This is a new economy, the sharing economy," declared Airbnb CEO Brian Chesky last November at an event for some the company's avid hosts, who routinely rent out their spare bedrooms and apartments for short-term stays through the company's website.

Answer: creator: Airbnb, Brian Chesky; chief_executive_officer: Airbnb, Brian Chesky; founded_by: Airbnb, Brian Chesky