There are more than 150 crude oils in the world but mostly Brent Crude and West Texas Intermediate, (WTI) is considered as the benchmark for the oil price. On Monday, WTI crude oil fell to zero. That simply means that buyers of the WTI didn’t want to take the delivery against their order. And the oil sellers paid the buyers to take the delivery. The cost of the barrel was $30. This happened because of according to futures contract buyers should have taken the possession of the oil barrels on or before Tuesday as the contract was expiring on that day.