作为领军世界的经济体，美国在确保经济增长方面任务艰巨。 因为它必须创造-并不仅仅是摹仿和改良-新技术、更佳的资本形式和更有生产效率的商业组织。
As the world's leading-edge economy, America faces the hardest work in ensuring growth, for it must create - not only copy and adapt - new technologies, better forms of capital, and more productive business organizations.