The Wealth of Nations by Part 4 Chapter 5 Page 90

which it has ever yet enjoyed; and both the supply of the home market, and the interest of tillage, are much more effectually promoted by the inland than either by the importation or exportation trade.

The proportion of the average quantity of all sorts of grain imported into Great Britain to that of all sorts of grain consumed, it has been computed by the author of the tracts upon the corn trade, does not exceed that of one to five hundred and seventy.

For supplying the home market, therefore, the importance of the inland trade must be to that of the importation trade as five hundred and seventy to one.

The average quantity of all sorts of grain exported from Great Britain does not, according to the same author, exceed the one-and-thirtieth part of the