at what stage of economy should entrepreneurship be pursued ?

Defining 3 stages of economy as as:
1) Boomed
2) OK - neither Booming nor Bed Ridden (a mid way between either)
3) Bed Ridden

We can now define 4 phases in economy:
a) When it is going from stage 1 to 2
b) When it is going from stage 2 to 3
c) When it is going from stage 3 to 2
d) When it is going from stage 2 to 1

The best time to start entrepreneurship is when economy is in "phase a" and you should roll out your product/service in "phase b"; when no one else dares to do so; thus capturing the market.