@tomleslie 

I have to admit that I have not tried do it fully, I have not done the greatest effort - there is no doubt about that. 
And you are right that you have provided all the necessary information. The reason for why I asked for the extra help was due to some time pressure. 

However, I have to say that it is absolutely wrong and improper to indirectly call me "lazy/incompentent". That is absolutely unacceptable. Shame on you. Those words are not acceptable here in this forum!  Mind your tongue.

I do not expect any answer to this message. 

@tomleslie Dear Mr. Leslie,

You are right about the question of aesthetics is a personally taste. 

I want to thank you very much for your extremely helpful and useful guide and reply to my questions. I appreciate that. 

I was wondering how can I add this little contribution to the graph? (I have attached an image).

The thing now is that I want a graph where the income functions are shifted, in this case, leftwards, i.e., the functions I^u_t and I_t^S are shifted leftwards. 

It will also be helpful to have the shifted income functions indicated so it is possible to see they are named I^s_t+1 and  I^u_t+.

Yours sincerely. 

@tomleslie 

Thank you very much for this useful answer. 
Now, I have some questions regarding the aesthetics of this graph. How can I hide the numbers on the y-axis like in the graph that was in the document I attached? 

Furthermore, can I indicate the two functions on the graph so it is possible to distinguish between I^u_t and I_t^S? I.e., I want to name the functions on the graph. 
Also, I would like to name the axes so x-axis is called "ability" and y-axis is called "Income".

Please have a look at the highlighted parts of the image that I have attached. I would like to have those things on my graph in Maple.

Kind regards.