Utilize the input text as a context reference, choose the right relationship between Goldman Sachs and investment bank from the options. Options: 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.

Influential U.S. investment bank Goldman Sachs said the fall in oil prices was a consequence of oil market oversupply.

Answer: product_or_material_produced