You completely ignore the benefit of the more accurate price
The gp does a good job of describing how insider trading actually takes money from particular people. Are you saying that a certain number of people should have their money taken in order that prices are closer to predicting otherwise unknown results? Something like "by eminent ___domain, we are taking your investment profits for the great good of accuracy in stock prices".
Moreover, the other people who benefit from price jumps from invisible sources are those who don't know anything but who are willing to gamble that these price jumps represent a real increase in value. The existence of such gambling would seem like it increases the overall volatility of the market and given that such gamblers would tend to magnify random jumps in the market as well, it seems like society broadly would not experience any benefit.
The gp does a good job of describing how insider trading actually takes money from particular people. Are you saying that a certain number of people should have their money taken in order that prices are closer to predicting otherwise unknown results? Something like "by eminent ___domain, we are taking your investment profits for the great good of accuracy in stock prices".
Moreover, the other people who benefit from price jumps from invisible sources are those who don't know anything but who are willing to gamble that these price jumps represent a real increase in value. The existence of such gambling would seem like it increases the overall volatility of the market and given that such gamblers would tend to magnify random jumps in the market as well, it seems like society broadly would not experience any benefit.