What is the relationship between circa and company in the context of the input sentence. Choose an answer from: 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.

"The home appliances market in Australia is circa $4.6 billion, larger than many of the other categories JB HI-FI operates in, and presents a significant opportunity for the company as it leverages the strength and trust in the JB HI-FI brand."

Answer: legal_form