They provided housing to those who could not provide housing for themselves and health education
Temples? Some were used by the Egyptian Pharoahs' families to house and dwell in. They also were used for storage or to plan military strategies with their military men.
The poverty of the inhabitants of a country has a primary impact in the country itself and also a secondary impact in other countries, especially those that are geographically closer and those that have a greater commercial relationship.
As a country has lower purchasing power, it will decrease the imports of goods and services offered by other countries.
Inhabitants of poorer countries tend to migrate to countries with higher incomes and consequently greater opportunities. This is why demographic changes can occur in both nations.
When a nation's economy occurs unexpectedly it can affect financial assets of countries that have particularities in common with it because financial markets often interpret that shared variables will also be a common cause of decline for them.
You need help with 3? The question is: How did Alexander spread Greek civilization. Well, we know he was a huge conqueror. The lands that he conquered he ruled over. So those people were part of Alexander's empire. This is how he spread the Greek civilization.