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One major way coal affects the economy is through electricity. The majority of America's electricity comes from coal. So when coal prices are low, like they are right now, electricity is cheaper and the lower prices spur economic growth.
Electricity is a crucial part of American life. In fact, it is a $200 billion a year commodity, making it the largest commodity in the United States.
When the prices for large commodities, like electricity, stay low or go down, inflation stays low. So, commodity price fluctuations prove to be strong economic indicators.