永远不要停止学习，因为世界从未停止变化。
Never stop learning, because the world never stops changing.
Thank you fans for your continuous support, without you there would be no me today.
"The world is a stage, but the play is badly cast."
学习计量经济学的最佳方法是通过实践——处理真实的数据和真实的问题。