The word 'centerpiece' refers to the decorative piece in the center of a dining table. In the German translation ('Kernstück'), we can also use it figuratively, e.g., to refer to the central point of a text or theory. For example, we may say:
Comparative advantage is a centerpiece of theories on international trade.
Does this usage also exist in English? If not, what would be a better translation ('mainstay' perhaps)?