您好，可能我这个问题比较白痴请问具体怎么根据回归方程计算出每年的边际溢出效应呢？

您好 可能我的基础知识不扎实 还请您不吝赐教  怎么根据回归方程具体计算出每年的边际溢出效应呢？

Model 2 in Table 2 shows that the impact of prior performance (when below social aspiration) on bribery expenditure is negative (b=-0.73, p<0.01). Marginal effect analysis reveals that, as performance (when below social aspiration) rises from two standard deviations below the mean to one standard deviation below the mean, bribery expenditure decreases by 24.80%.

您好，请问这里回归系数等于-0.73，边际效应是24.8%，这是怎么得来的？原理是什么？

文章：
Xu D, Zhou K Z, Du F. Deviant versus aspirational risk taking: The effects of performance feedback on bribery expenditure and R&D intensity[J]. Academy of Management Journal, 2019, 62(4): 1226-1251.