Question: Two experts, A and B , each predict the direction of the A - share stock index for the next month ( with two possible

Two experts, A and B, each predict the direction of the A-share stock index for the next month (with two possible predictions: up or down). Expert A has made 120 predictions with an accuracy rate of 80%. Expert B has made 2500 predictions with an accuracy rate of 60%. Which expert would you be willing to pay for their advice, and why?
I'm wondering if there is any statistical way to measure which one performs better.

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