Answer:
Self interest causes the growth of economy which in turn causes the betterment of society.
Step-by-step explanation:
According to economist Adam Smith, self-interest is the key motivator behind any economic activity. For example – we all go to office to work in order to earn money and feed our family. This act can be considered as self-interest but eventually the work which is being done is aimed at serving some economy. As the economy grows, the society also gets benefited.
Hence, in lieu to the self-interest if an individual works day and night then eventually he/she ends up adding something to the economy which in turn benefits the society.