Source: Matt Egan, CNN, 10/11/21

The cost of energy was dirt cheap in the spring of 2020 as roads and airports sat nearly empty during the height of the Covid-19 pandemic. Energy demand is back today as the world economy reopens -- but supply simply hasn't kept up. That's why US oil prices have skyrocketed $120 since crashing to negative $40 a barrel in April 2020. US oil prices finished above $80 a barrel on Monday for the first time in nearly seven years. 

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