Ahh, the million dollar question.......what does it really cost?
This is for sure an interesting discussion topic as I am sure we would all like to really know the answer to the burning question of how much our IBs are making from our trading efforts. The answers should be interesting and wide ranging but it is unlikely you will get any truly accurate ones. The truth behind the numbers is a highly guarded secret for the IBs.
There are no simple answers either because virtually every firm has a different arrangement/ business model and hence the variance in commission rates. A firm's commission has essentially 3 components that make up the total cost;
1. Software/ execution costs/ exchange fees
2. Clearing costs
3. Firm profit margin (from which the firm must cover its overhead)
As far as clearing costs go I think that there are different clearing rates for different types of accounts. That is, a retail account is subject to a different rate than a 'Prop.' account. I also believe that some firms are able to negotiate clearing based on a per stock per day basis and under such an arrangement it makes clearing costs negligible. This type of arrangement is most beneficial in a 'Prop.' type of environment where several traders may trade the same stock and large daily volumes. I do not know exactly how self-clearing works but I believe that the cost advantages are similar to that of having proprietary software.
A firm that has proprietary software can set its own per share cost structure and obviously be more competitive on commissions than a firm that must pay software costs to a third party.
Given all the factors that go into the commission costs that the trader must ultimately pay, you can see why commissions vary so much from firm to firm. Just like every other business, some firms can gain competitive advantages be internalizing certain functions, but obviously it is a matter of scale and for most firms it is more economical to outsource things such as clearing and software.
I will watch this thread with interest to see what, if any numbers on clearing costs are thrown out there. Should be interesting but I guess the bottom line is that your IB is in business to make money not to give services away for free. He is going to charge what the market will bear and his cost is somewhat irrelevant.
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