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Maybe over a long enough time horizon with enough trading activity, one can effectively buy/sell a company at the market cap? But clearly over short horizons, you wouldn't be able to due to illiquidity. Some companies would be faster sales, others would be slower.
I'm not aware of any metrics that combine market cap with how resistant the price is to fluctuations, so I thought I'd ask if anyone else is. Such a metric, in my mind, would be a more accurate way to compare values between two similarly-valued behemoths.