own creation.

x, y players' payoffs;

S set of available payoffs;

y=Nx(x) the neutrality function of positional investing as seen by player X;

y=Ny(x) neutrality function of positional investing as seen by player Y;

Ex the equilibrium point, i.e. the point that satisfies the condition of individual rationality, collective rationality, reachability and neutrality of positional investing as seen by player X;

Ey point of equilibrium, i.e. the point that satisfies the condition of individual rationality, collective rationality, achievability and neutrality of positional investment as seen by player Y;

xx0, yx0 player payoffs at the equilibrium point as seen by player X;

xy0, yy0 player payoffs at the equilibrium point as seen by player Y