To which extend do you think market fragmentation (as a result of reg NMS) is part of the problem?
If i understand your reference to "hidden liquidity" correctly, you have simple order types and when compared to other venues.
Wouldn't it be better for price discovery, if all US equities were traded in one continuous limit order book instead of across a dozen venues, each with its own funky order types and quirks?
XKCD as usual quite prescient about the problems of standardization. I think pretty much everyone agrees with your solution -- so long as their platform is the one that everyone standardizes on!
The sad reality is that because of these issues (and, to be fair, others) most trading is moving off lit exchanges altogether. For some companies we are talking about 80% or more of the volume, and this would be even higher if not for the requirement that day-open and close auctions happen on the "home" exchange.
We have made a proposal to the SEC to bring this off-exchange activity back into the light of the protected quote, but nothing to report at this time about how, when, or if this will come to fruition:
https://longtermstockexchange.com/resources/docs/LTSE_Exempt...
If i understand your reference to "hidden liquidity" correctly, you have simple order types and when compared to other venues.
Wouldn't it be better for price discovery, if all US equities were traded in one continuous limit order book instead of across a dozen venues, each with its own funky order types and quirks?
if you agree, i cannot help but think about this xkcd https://xkcd.com/927/