| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | trade | Ancient Civilizations | Trade often relied on bartering, local markets, and transportation by pack animals or boats along rivers and coastal routes. | 1 |
| 2 | trade | Early civilizations | Crucial for the economy and cultural exchange in ancient Mesopotamia, Egypt, and the Indus Valley | 1 |