Oil prices hit their lowest levels in more than four years, with the benchmark Brent falling below the $60-per barrel mark as concerns of a supply glut spooked investors. The concerns came to the forefront after the Organization of the Petroleum Exporting Countries and their allies decided to accelerate production increases over the weekend. The decision spread fears that increased supply at a time when demand remains sluggish amid the ongoing uncertainties in the face of Trump’s tariff wars would result in an oversupply, hurting oil prices.