Why don't more US firms move to Mexico to take advantage of low wages there?

Answer 1

Some of them can't move because the end product does not require cheap labor or is perishable, such as foods and beverages. Other firms would find an increased cost if they move into Mexico due to more expensive raw materials, such as wood and furniture plants. Finally, some other require very high-trained and specialized people who would cost almost the same even if they are hired in Mexico, such as electronic or aircraft design.