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.
Specialization. In the economic sense, the social phenomenon of individual human beings or organizations each concentrating their productive efforts on a rather limited range of tasks. Specialization entails focussing on a narrow area of knowledge or skill or activity.