A tariff on imports in a large importing country decreases the welfare of producers in that country, affecting consumer and producer surpluses.
Decrease is the effect of a tariff on the welfare of producers of the product in the large importing country. When a large importing country imposes a high tariff on imported goods, it leads to a decrease in consumer surplus in the import market and a rise in the exporting country's consumer surplus. This results in an increase in producer surplus in the importing country but a decrease in the export country.
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