Authors: Yucheng Wu; Yueqiang WuCorresponding Author: Yucheng Wu; Independent Researcher Email: 1417668066@qq.com; yucheng.wu@uqconnect.edu.au This is an English version of Principles of Trend Economics. The Chinese Version is available at Zenodo: 中文版:DOI: https://doi.org/10.5281/zenodo.20024794
Wu et al. (Tue,) studied this question.