Demand: Supply:

Country A (Importer)

Price Change $0
Consumer Surplus $0
Producer Surplus $0
Gov Revenue $0
Deadweight Loss $0
Terms of Trade $0
Net Welfare $0

Country A

Supply
Demand
CS
PS
World P
+Tariff
Autarky
Trade
50
Free
Revenue
$0

Country B

Supply
Demand
GR
DWL
World P
+Tariff
Autarky

Country B (Exporter)

Price Change $0
Consumer Surplus $0
Producer Surplus $0
Gov Revenue $0
Deadweight Loss $0
Terms of Trade $0
Net Welfare $0
With 0% tariff, goods flow freely at world price. Both countries maximize welfare.
$50
A Price
$50
B Price
50
Trade
$0
DWL