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Mining
Miners are the people, groups, or businesses that focus on mining for its profitability. Even as Bitcoin's price fluctuated over the years, it remained a lucrative endeavor—if it hadn't, the large mining businesses wouldn't have continued operating.

However, a halving cuts mining rewards, so the endeavor becomes less profitable with each halving if prices remain the same or drop. The large-scale mining facilities needed to remain competitive require enormous amounts of money and energy. The equipment and facilities need maintenance and people to conduct it. They also need to upgrade their mining capacity to maintain their position in the industry.