Automatic enrollment in a company's pension plan is the kind of commitment device that could force an employee to start saving part of his salary for retirement purposes, often automatically and with minimal further steps required.

Country A has an absolute advantage in both wheat and wine since it can produce more of both goods with the same resources compared to Country B.
However, when using opportunity costs, Country A has a comparative advantage in wheat because it has sacrificed less wine in order to produce wheat and vice versa.