Gettyimages 51143722
On Monday, U.S. oil prices dropped to a 12-year low. - 

There are two main prices of crude oil in the world — Brent and WTI, short for West Texas Intermediate. WTI is the American price and for years it has been sold at a lower price than Brent, but now it has totally caught up.

Marketplace Sustainability Correspondent Scott Tong explains what this tells us about world oil markets.

Produced by Mukta Mohan 

Follow Adriene Hill at @adrienehill