What is the relationship between Thomson Reuters and Toronto Stock Exchange 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.

In particular, Thomson Reuters share price purchases will be dictated for by private agreements will be at a discount to the prevailing market price on the Toronto Stock Exchange (TSX) at the time of purchase.

Answer: stock_exchange