Question: How do I make a graph like the attached? It's about steady state equilibrium

I would like to know how to make a graph like the attached. The Figure IV is showing the changes in the evolution of the rate of technological progress (a topic in economics).

I would like to make a graph exactly like the image attached where it clearly shows the name of the x- and y-axis; the name of the functions; the 45-degree line; the transition from "theta_1" to "theta_2" with the arrows, etc. (In fact, I want to have everything the same from the graph). 


I have attached a PDF document with the definition of the functions and the figure itself. I have also attached the image of the figure on this thread. 



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