A data demand too far

Data overload, or in the case of the forthcoming Markets in Financial Instruments Directive (Mifid) review, data over-demand - that's what's required from market participants and infrastructures so regulators can evaluate trading efficiency, transparency and safety. PJ Di Giammarino, chief executive of think tank JWG Group, explains to Jeremy Grant, FT Trading Room editor, why the demand for data has exploded and why this is much too much.