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Why do futures prices converge to spot prices?
Because on the settlement date, the futures will expire, and they are already in stock, so they cannot be inconsistent with the spot price.

Otherwise, you can arbitrage, such as buying from the spot market and delivering in the futures market. This can't happen. Once this arbitrage opportunity appears, a large amount of funds will flood in and eliminate the arbitrage opportunity. Therefore, as the settlement date approaches, futures prices converge to spot prices.