Trade.
The Phoenician city-states had limited agricultural land to support a growing population. They had to expand by conquest or trade. They chose trade.
Each had its role in building up the Phoenician trading empire.
It was spread through trade with foreign people.
The Phoenician traders took their alphabet with them and it was adopted and adapted.
The Mediterranean Sea.
they trade silver work ivory carving and slaves
It developed from trading Phoenician goods int carriage trade - that is shipping locally-produced goods between other centres.
The Phoenician trading ship spread their writing system around the Mediterranean Sea.
Trade and alphabetic writing.
Farming at home, and externally, trade.
Tyre, Sidon, Carthage.