索洛的开创性工作之后，许多在此基础上的扩充模型被不断提出。例如实际经济周期理论（Real Business Cycle Theory）就是在索洛模型基础上考虑最优消费问题的一个崭新的新古典派经济学基础理论。但是，这些模型基本上把技术进步视为某种外生的冲击，与80年代中后期产生的注重技术进步内生化的新经济增长模型（或内生经济增长模型）形成鲜明对照。
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