International trade is the exchange of goods and services between countries. Trading globally gives consumers and countries the opportunity to be exposed to goods and services not available in their own countries, or which would be more expensive domestically.
Inter-regional trade refers to trade between regions within a country.
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DIFFERENCES
Factor Immobility
Differences in Natural Resources
Geographical and climatic differences
Different Markets
Mobility of Goods
Different Currencies
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Problems of Balance of Payment
Different Transport costs
Different Economic Environment
Different Political Groups
Different National Policies
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SIMILARITIES
Factor Mobility
Difference in wage rate
Factor Endowment
Currency difference
Price discrimination
Comparative cost
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CONCLUSION
Therefore, the classical economists asserted on the basis of the above arguments that international trade was fundamentally different from domestic or inter-regional trade. Hence, they evolved a separate theory for international trade based on the principle of comparative cost differences.