That's all you need tbh just sketch one up real quick.
Yeah, for distribution of income/wealth - I'd say for ''evidence/economic theory'':
STATISTIC - Gini-coefficient (also more generally, average income levels by age, gender, location, etc.)
DIAGRAM - Lorenz Curve
are enough.
NOTE: Do NOT use pie graphs/column graphs/etc. in your economics essays.
1. They can be time consuming to draw up.
--> Essentially, they have the same ''effect'' as statistics, which makes them not worth the effort at all.
2. They don't illustrate your knowledge of economic theory to the marker.
3. Just don't do it.