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.
Very highly skilled workers may fall under the category of professionals, rather than skilled labor, such as doctors and lawyers. Examples of skilled labor occupations are: electricians, law enforcement officers, computer operators, financial technicians, and administrative assistants. Some skilled labor jobs have become so specialized that there are worker shortages.