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so are you saying limit order sent to a marketmaker are not shown? much like a pit filling broker's deck from years long gone

payment for order flow requires that the market maker matches the nbbo. firms pay for order flow so they can be at the front of the queue. collecting tolls. imagine a security where bid/offer never changes and has even volume for buys and sells. it is clear that firms would pay for that flow...

why lousy fills if you set a limit price? or are sold limit orders never displayed to wider market

a few lines in python. more lines in c++

Not sure what he was. Maybe a promoter. It was strange. The audience looked at risk

They will be shutdown down. They target people with no clue offering matching deposit up to a certain amount. I saw one of there salesman speaking to a group of young people in park.

no

what's the savings? US taxes citizens living abroad, so a us citizen can move to florida, texas, nevada, wy, ... to escape state taxes.

you're assuming an increase in money supply increases stock market liquidity which is incorrect. in regards to your topic title, fed adding liquidity just means increasing money supply... done through debt monetization

maybe it's all inflation adjusted. look at entry level salaries; they've doubled over a short period

historical quotes? you can check against multiple sources. live quotes? you can check against multiple sources. Similar to subscribing to udp data feeds and making sure that you did not drop anything

1) You're saying orders are published as filled before they are filled? Can those fills be cancelled too? 2) Is this large order a resting limit order? Or do people place large market orders? 3) How can a firm get a rebate without expected criteria? What exchange is this for? don't look behind...

using technology or anything to make a 1 penny 10 or 20 million times a day. There used to be an advantage to where one stood in the pit, how load one was, aggressive, ... Those still exist in other ways. I heard the argument of front running but never see it in practice or even explained on...

Didn't specialists and pit traders do this for years. Computers today

you don't have to make money to make money. Where are the customer's yachts?

buy a single button keyboard and set a hotkey https://techkeys.us/products/onekeyboard#:~:text=The%20OneKeyBoard%20is%20just%20that,combination%2C%20or%20shortcut%20you%20wish.

margin depends on the broker you use. this thread seems unrelated to posted topic

cool. my strategy buys at a price then sells resulting in a profit. If that's what you're looking for set up the account and send me a retainer

sure. you put up the money?

https://www.oreilly.com/library/view/practical-time-series/9781492041641/ch04.html https://stackoverflow.com/questions/16024677/generate-correlated-data-in-python-3-3 add an auto arbitrager to keep things inline and allow orders/trades to impact prices first product could be odds this project...