The Wealth of Nations by Part 1 Chapter 11 Page 271

I believe, more or less in every country.

Though the success of a particular day’s fishing may be a very uncertain matter, yet, the local situation of the country being supposed, the general efficacy of industry in bringing a certain quantity of fish to market, taking the course of a year, or of several years together, it may perhaps be thought is certain enough; and it no doubt is so. As it depends more, however, upon the local situation of the country than upon the state of its wealth and industry; as upon this account it may in different countries be the same in very different periods of improvement, and very different in the same period; its connection with the state of improvement is uncertain, and it is of this sort of uncertainty that I am here speaking.

In increasing the