I for one, think this would be a great idea. The micro trades are already a large part of the problem with the stability of the market. A tax might inhibit some of this type of trading (and that’s coming from the son of a specialist broker whose dad worked his whole life on the floor of the NY Stock Exchange)
http://www.dailykos.com/story/2011/11/07/1034109/-Transaction-tax-would-raise-$350-billion-over-next-decade?via=blog_1=
Tax On Trades
Richard Pace 