和訳してほしいです

But this in itself is not sufficient, for it must also be shown how these private decisions will be brought into conformity with the interest of society.
What is the mechanism by which individuals, who have no object but their own personal gain, are "led by an invisible hand" to promote the welfare of the community?
And Smith's answer was that the mechanism was to be found in the market system operating through the forces of competition.
In so stating,he was delineating a set of problems which have remained central to modern economics to this day.