Conversation so far:
What was Gaelic Ireland's economy based on?
The economy was mainly a pastoral one, based on livestock and their products.
Who did the Gaelic Ireland residents trade with?
Gaelic Ireland was involved in trade with Britain and mainland Europe from ancient times, and this trade increased over the centuries.
Did the Gaelic Ireland residents trade with any other countries?
Tacitus, for example, wrote in the 1st century that most of Ireland's harbours were known to the Romans through commerce.
Did Gaelic Ireland trade for items or for money?
Gaelic Ireland used to not really use money and mainly trade for items.

Question: What kind of goods and services were exchanged?
Self-contained rewrite: What kind of goods and services were exchanged in Gaelic Ireland?