Better stop short than fill to the brim. Oversharpen the blade, and the edge will soon blunt. Amass a store of gold and jade, and no one can protect it. Claim wealth and titles, and disaster will follow. Retire when the work is done. This is the way of heaven.
A nontariff barrier is a way to restrict trade using trade barriers in a form other than a tariff. Nontariff barriers include quotas, embargoes, sanctions, and levies. As part of their political or economic strategy, large developed countries frequently use nontariff barriers to control the amount of trade they conduct with other countries.