What are the reasons for the development of science and technology during the Spring and Autumn Period and the Warring States Period?

Reason: Since the Spring and Autumn Period, the popularization of ironware and Niu Geng has greatly improved productivity. The development of productive forces will certainly have an impact on production relations and superstructure. It also impacted the ruling order and concept at that time. This period is also a rare opening period in history, showing a lively and upward post-atmosphere, which will inevitably produce reactions in various fields.