Solow Model

Solow model defines income per capita function f(k)=F(K/L,1) with f'(k)>0 and f''(k)<0 and proves that there must be an intersection with (gL+gA+δ)k where growth rate converges. But it confuses me that how to draw the 'warranted growth', 'actual growth' and 'natural growth' curves (maybe per capita) in Harrod-Domar diagram like Solow and shows its conclusion? I have never seen yet. By the way, why Solow model discard 'warranted growth'? What will happen if warranted growth is not equal to actual growth in Solow model?


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