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.

Takoradi, Aug. 17, GNA - Mrs Joyce Esi Boakye, Manager, Listing, of the Ghana Stock Exchange (GAX), has encouraged Ghanaian businesses to list on the stock market as another avenue of boosting their capital base.

Answer: operator: stock market, Stock Exchange