def analytic_solution(y, nL, alpha):
D = ((<NUM_LIT:1> + alpha) / <NUM_LIT:2>) * (nL / yL(nL, alpha)**-alpha)**<NUM_LIT:2> - yL(nL, alpha)**(<NUM_LIT:1> + alpha)<EOL>return y**(-alpha) * (<NUM_LIT:2> * (y**(<NUM_LIT:1> + alpha) + D) / (<NUM_LIT:1> + alpha))**<NUM_LIT:0.5><EOL>
Analytic solution to the differential equation describing the signaling
equilbrium of the Spence (1974) model.