A 4-column table has 2 rows. The first column is labeled country with entries Country A, Country B. The second column is labeled Cost (units) with entries 1, 1. The third column is labeled Petroleum (units) with entries 16 (0.5 O C), 8 (1 O C). The fourth column is labeled Seafood (units) with entries 8 (2 O C), 8 (1 O C).

The opportunity costs are shown in parentheses in the table.

According to opportunity costs,
should specialize in petroleum.

According to opportunity costs,
should specialize in seafood.

Country A should specialize in petroleum.

Country B should specialize in seafood.