What is the relationship between prime and retail 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.

Improving the dark pool while winding down retail market-making is part of Mahajan’s overhaul strategy, which is based on winning business from quantitative hedge funds that already are clients of other parts of Goldman Sachs, such as the prime brokerage.

Answer: industry