The roads may have been rough, but people have traveled and shared their goods from ancient times. Ancient peoples also traveled by sea in boats.
The Chinese
Some of the items they traded were spices,gems e.t.c
Buddahism
They built roads, traded along the Mediterranean Sea and farmed grapes and olives
Its cheap
They traded plants and animals and tobacco
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They were shipped from different places
They traded items that the have a surplus of for items that they cannot get.
The Australian Aborigines did not have roads before 1788. They had no need of roads. They were able to walk wherever they wanted, including crossing the Blue Mountains, which the Europeans were not able to achieve for some 25 years. The Aborigines were not encumbered by having to carry heavily loads, and they did not use animals to carry or drag items,
silver and gold
The answer is silk and and tea