What invention of the Phoenicians was associated with their occupation and trade?

The Phoenicians invented the alphabet, but even this is not the most interesting invention. Money became the most unusual invention of that time and was also invented by the Phoenicians who were engaged in trade. Previously, goods were simply exchanged for other goods, but it was very inconvenient to transport some sheep or cows on ships by sea, so money became the invention that became the only measure for the exchange of all goods.