Q.
What is the most significant of 'the invisible hand' by Adam Smith?
A.
The free market economy is fueled by the 'invisible hand' and demand and supply is determined by the mass public. Hence, price is not control of one person or one government planner, but by a marketplace where interaction between many users and producers would determine the appropriate price and as such, the price would raise or fall according to the supply and demand of the users and producers.
In such interaction, everyone is first to satisfy one's own needs rather than helping a fellow man. In doing so, the benefits or 'benevolent' is not promoted as public interest but self interest as Adam Smith put it as 'self-love' or 'own gain'.
Ref:
N. Gregory Mankiw (2012) Principles of Economics, 6Ed. South-Western Cengage Learning. Pg 12. Available from www.cengage.com.