If the value of the gift exceeds $100, you will be required to pay duty. If you have goods you intend to sell in the U.S., they will most likely be subject to duty, unless they are eligible for duty-free treatment under an international trade agreement (GSP, NAFTA, etc.).
Specialization of labor is a powerful force in an economy, benefiting small and large businesses alike. Workers produce more when they occupy specialized roles, so businesses can offer higher quality products at lower prices.
Medical Definition of specialization. 1  1: a making or becoming specialized specialization in pediatrics. 2  2a: structural adaptation of a body part to a particular function or of an organism for life in a particular environmentb: a body part or an organism adapted by specialization.