Are the people in Zhenguan, Kaiyuan and Kanggan happier than they are now?

This problem should be treated dialectically. First, the above periods were the prosperous times of ancient China, and people's lives were better than those of other dynasties or some tyrants. Second, after all, in feudal society, the development level of productive forces is not high enough, and productive forces determine the relations of production. The development of social productive forces is definitely stronger than that in ancient times. With the development of science and technology, we can enjoy more means of material life, so we should be relatively happy.