Why oil prices are trending

<p>Almost immediately after President Donald Trump agreed to a two-week ceasefire with Iran on Tuesday, crude oil plunged to the lowest level in about three weeks. CNN's Matt Egan explains when you might see lower prices at the gas pump. Discover more videos, including live streams and exclusive storytelling, on our <a href="https://www.cnn.com/watch">Watch</a> page.</p>