Guidlines on Size of Portfolio Cash Flow Reqd Compared to Asset Base

The ability to take risk seems highly reliant on this. However there seems to be some ambiguity with the definition. How would you judge if they have a moderate/low asset base compared to size of portfolio. It definately doesn’t seem related to portfolio return required.

Another question - what portfolio return is deemed too high? The average on the portfolios (nominal before tax) is around 11% and (nominal after tax) seems to be around 8%.

Any advise much appreciated.