The Wealth of Nations by Part 2 Chapter 5 Page 21

To attempt, however, prematurely and with an insufficient capital to do all the three is certainly not the shortest way for a society, no more than it would be for an individual, to acquire a sufficient one. The capital of all the individuals of a nation has its limits in the same manner as that of a single individual, and is capable of executing only certain purposes.

The capital of all the individuals of a nation is increased in the same manner as that of a single individual by their continually accumulating and adding to it whatever they save out of their revenue. It is likely to increase the fastest, therefore, when it is employed in the way that affords the greatest revenue to all the inhabitants of the country, as they will thus be enabled to make the greatest savings. But the revenue of all the inhabitants of the