I'd venture to say directly -- current lvl2 data shows about 1-10% of previous order depth available. Which also asks the next question, how much of the price

I'd venture to say directly -- current lvl2 data shows about 1-10% of previous order depth available. Which also asks the next question, how much of the price action and volume is automated trading in these platforms? Not that automated is necessarily good or bad - but how much is a retail interest