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You should use multiple ad groups when you want to:
Merchandise Trade
International trade in goods as opposed to services, including both exports and imports of physical products.
Tangible Products
Physical items that can be touched, seen, and measured, such as electronics, clothing, and furniture.
Intangibles
Non-physical assets such as patents, copyrights, brand recognition, and goodwill that have value but are not physical objects.
Merchandise Trade Balance
The difference between a country's imports and exports of goods.
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