In today's world, there is a noticeable trend: citizens in developing nations are experiencing a progressive increase in happiness levels, while those in wealthier countries are becoming more dissatisfied and unhappy. This essay aims to explore the reasons behind this phenomenon and propose practical lessons that can be learned from it. Admittedly, there are several compelling explanations for this trend. Primarily, the growing economy of developing nations empowers average citizens to enhance their quality of life. People who once lived in poverty now have access to stable jobs, better healthcare, homeownership opportunities, and quality education. This improvement in living standards contributes to higher levels of happiness. Conversely, residents of developed countries face challenges in maintaining their success, which significantly impacts their well-being. With basic needs already met, individuals in these countries often develop higher expectations for personal achievements and social status, leading to increased pressure and stress, ultimately resulting in anxiety and depression. Therefore, there are valuable lessons to be learned from this phenomenon. Firstly, fostering a prosperous and sustainable national economy is crucial for promoting happiness among citizens. Stable employment provides individuals with financial security, reducing concerns about money and fostering a sense of fulfillment and peace. Additionally, achieving a balance between physical and mental well-being is essential for cultivating a culture of optimism. By prioritizing health and wellness, individuals can manage their time more effectively, allowing for relaxation and engagement in activities that promote happiness and fulfillment. In conclusion, economic development plays a significant role in fostering happiness among citizens, while the pressure to maintain success is a challenge faced by residents of developed nations. However, I maintain that economic enhancement, combined with a balanced lifestyle, is essential for promoting the growth and happiness of all residents.