What is neoclassical economic growth model C?

What is neoclassical economic growth model C? A: Romer model.

Neoclassical economic growth model is the economic growth theory of modern neoclassical school. It was first put forward by American economists Thoreau and Swan in 1956, a theory of economic growth and economic growth and capital accumulation. Later, the British economist Meade made a systematic statement in a neoclassical economic growth theory published in 196 1. Because their model regards full employment as an inevitable trend like classical economists, it is called neoclassical growth model. This model is different from the assumption of Harold-Thomas growth model in two aspects. First of all, suppose there are two factors of production, capital and labor, which can replace each other. Accordingly, a certain amount of capital is combined with more labor, and the capital productivity is high; On the contrary, capital productivity is very low. In Harold-Thomas economic growth model, capital and labor are combined in a fixed proportion. Second, it is assumed that at any time, capital and labor can be fully utilized. Because capital and labor can be replaced, under the condition of perfect competition, there will be no problem of idle production factors.