[jwarden]

Assuming a self-similar 80/20 Pareto wealth model (a fractal Lorenz curve), the headline number generalizes as:

    Just x%   | % wealth held | × poorest half
    ---------+---------------+----------------
    20%      | 80%           | 4.00x
    4.0%     | 64%           | 3.20x
    0.80%    | 51%           | 2.56x
    0.16%    | 41%           | 2.05x
    0.032%   | 33%           | 1.64x