How to read capital efficiency
Capital efficiency asks how hard the money worked. Two traders both up $15,000 are not equal if one moved $100,000 through the book and the other moved $500,000.
It is the ratio that ranks strategies rather than personalities. High-volume market making can run profitably at a fraction of a percent; a selective directional trader taking a handful of positions a month should be far higher, or the selectivity is not paying for itself.
Why locked capital raises the stakes
Prediction-market capital is committed until the market resolves. Money sitting in a position that will settle in four months is money that cannot take the next opportunity, and no P&L figure records that cost.
This is the argument for reading efficiency next to holding period. A 3% return over two weeks and a 3% return over seven months are different businesses.
Where to see it
Trader profiles report P&L and volume, which is the pair this ratio comes from. 0xinsider does not publish a single efficiency percentage per trader; reading profit against volume on the profile gives the same comparison without hiding either input.