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check revenues of susq vs virtu. either way it's all software now

in the case you describe then yes the market maker would be losing money on that specific instrument. but usually things bounce a little up and down or sit still. ie. eurodollars barely move so a MM can buy at 96.25 and sell at 96.5 all day or week. also MM are not restricted to one instrument...

25 years ago matlab was great. given to colleges and students were locked in. today, other than ui, it's still the same thing but there are alternatives that are better and free.

totally agree. consider how much you value your time and you're probably better off

modern day indentured servants?

why? show an example

how many human traders still there... under 10?

assume stock XYZ trades exclusively on NYSE. if you see a quote 55.44/55.47 and try to penny the bid the displayed quote wont change

I still have a 401k from a prior employer sitting in the same fund at the same place. Only issue is to not forget about it. :cool:

without further detail try... if(Opens()==0 && Symbol in ['GC','SI',...] )

so you want someone to back test your strategy for free? you could approach CTAs with your strategy and if they are gullible enough will test it, then you'll have your answer

so a stop limit that becomes marketable will be filled after a market order arrives? doesn't make sense to me

I say the limit order is filled first. It is already at the exchange and in the queue. so if you send a market it needs to travel. this is why some people will use stop limit orders to get into positions.

The libraries ,fix or tws, you use are multithreaded. As a user of those libs you don't need to worry about threading. Just implement the required interface and thats it. Its not as complicated as others think

fix is a protocol; you can use any language. you dont need a server or anything more than what tws requires other than a fix library (quickfix is free). whatever you write with tws will be similar for a fix connection. i usually create helper functions to build orders. no matter the protocol or...

you don't choose the version of fix. it's whatever IB is using. if you know fix (quickfix lib) and can program you could get something going in under an hour; wont be great. You could probably find some helper functions that build orders, cxl, cxl_replace

its always easier to write from scratch rather than dig through someone else's example and figure out what it's doing. Looking at your list you just need to implement the callbacks in tws api

agreed. i like it for tests where you can grab the schema/data from a large database and load into it http://odo.pydata.org/en/latest/. also, the in memory option is good for embedding; saw it used in multiplayer games

on startup RequestForPositions

what does FIX have to do with how you calculate positions? usually, when you start your software you read in your positions from somewhere then as you place orders and get fills (execution reports) you update your positions nad persist them somewhere