As someone who is not very financially orientated, I find this difficult. Firstly because I don't really have a feeling for what that % means - presumably the ratio of market cap to book depth gives an indication of how sensitive the market cap is to large orders. So it combines liquidity and total volume - but I don't know why you would combine them into one statistic? Either I want a single number which means something clear, which this fails on. Or I want more information, in which case isn't it just better to tell the market cap AND book depth?

Also whilst market cap is easy to measure, book depth seems more difficult. How far away from the touch do you count? A million dollar offer which values bitcoin at 3cents represents almost no information. Firstly because by the time the price drops there's no way that offer will still be good and secondly because even if that offer were still good that change in price would represent a total shift in the market.

Also, this seems to compare apples to oranges, because some coins will contain market makers who are likely to leave orders in the book and cancel in response to signals, thereby creating phantom liquidity whilst others won't have enough volume to attract market makers and so all the depth is real.