Question: Scalling 3d Graphs along an axis

Thanks everyone for helping me over the years. I've just handed in my PhD- and I really considered Maple Primes like a supervisor.

Currently I am relearning Financial maths - as depending on grants I may leave academia :(

Today I am learning utility functions and risk aversion and thought to make a graphso i could visualise them

 Here is a graph of the log of the utility of x - with two utility functions - constant absolute risk aversion (lower surface) - and constant relative risk aversion (disjoint surface above); for both functions  g (and in the attached worksheet R) is a parameter of these functions; annoyingly for these versions of these functions to be plotted on the same axis - they are so different in scale that it is hard to see anything interesting.

However one of the key features of utility functions is that we consider them to be unaffected by scalling- i.e. that if U_2(x)=c*U_1(x) for all x then U_2(x) and U_1(x) are considered to be the same function.

This means that scalling can be done in a much more useful way than what I have done. Instead of plotting f(x;R)=x^(1-R)/(1-R) on the interval I (x=1..100), i'd like to plot g(x;R)=f(x;R)/max(f(x;R),I)  on the interval I.

I worked out that on a 2d graph this can be done using maximise. But I'd like to plot g(x;R) in 3d as both x and R vary and i cant think of how to do that! 

Cara_functions.mw