Little more than a gimmick. It will not stop institutionalized investors will find other financial products to invest in, move those transactions elsewhere or find a way around the tax. HFT is essentially irrelevant to those that are not part of the trading as long term health of an asset is not phased by short term fluctuations.
The government will not get a tiny fraction of what it says it will out of the tax, more regulation is not going to help the average guy's 401k in any way and the spending that the tax is supposed to go to will not only exceed the projected gains but will not change when the government reveals that they are making far less than projected.
I see your words, but need proof of what you say is true.
ALL money made by HFTs is stolen from investors.
First, its not 'stolen' as that necessitates taking from someone without their consent, consent you give when you agree to buy and sell stock. Claiming it stealing is like whining the card players at the poker table stole from you because they are better at the game.
Second, that money comes from other high frequency or institutional investors. Not a single one of my investments has been effected by HFT because I do not invest short term. That a stock may half, double and then half again in price over the course of a month is irrelevant to the vast majority of investors, all that matters is the price point you get in and out. If you are not involved in short term trades then HFT does nothing to your investments. Short term volatility is simply not relevant.
If you are a short term investor then you are getting exactly what you want. All a tax on HFT does is attempt to remove a specific market for trades.
Finally, you have provided no proof that HFT traders steal anything. Your complaints about insider trading are not even remotely relevant to HFT, you can trade on inside information or manipulate the market without participating in a lot of transactions. We do know the government will not get what it thinks it will because they never raise the amounts they promise. Same thing goes with what happens to the money raised. You can guarantee that adding this tax will only increase the debt because the tax is not even represented as a function of raising funds, it is represented as a function of WHAT THEY CAN BUY WITH THE TAX.
IOW, the money would already be spent and even if it is done through reconciliation (which requires it to be deficit neutral iirc) it would still fail as there is zero chance they would actually ties the amount spent with the amount raised.
There are 2 reasons I can see to support something like this:
HFTs are an infringement on the people's freedom - Give me a good reason that the government should be infringing on my freedom to trade as I see fit because that is what you need. Not that more advanced individuals and/or institutions are taking the majority of the gains, that happens in every single field or economic activity in existence. 100 percent of them. There is not a single example of that not being the case. Tell me exactly how those HFTs are infringing on my freedom. Then there is a case to limit them.
or
Taxing HFTs is a necessary and proper source of funding for the federal government. That I think is rather indefensible but then again I think the government should be funded in an even manner without all the special interests, outright thuggish control or specifically targeting small groups of people.
Not liking HFTs because they can be used in a manner you do not agree with is not one of them.