Trading volume decreases, open interest increases, and prices fall, indicating that both bulls and bears in the market are in a state of wait-and-see. Although overall the bearish volume is greater than the bullish volume, the bears lack confidence. The market may experience a decline in the future, but the probability of a decline in this combination of 'price, volume, open interest' is greater when trading volume increases, open interest increases, and prices fall.
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To summarize this 'price, volume, open interest' combination: trading volume decreases, open interest increases, prices fall, and the future is uncertain. Combining with the previous market trend, if the overall trend is down, then the likelihood of a decline in the future is high. I usually incorporate the overall trend when dealing with such market conditions, shorting in the direction of the overall trend.