What they consider most are labor and capital when they are studying economic development. And a lot of researches have been focusing on these two factors, which are based on the assumption of David Ricardo in the 19th century.

• 在研究经济增长时,考虑最多的就是劳动力和资本,很多研究也基本上围绕着这两个要素展开的,这个理念主要是基于19世纪的大卫·李嘉图的假设。