The Wealth of Nations by Part 1 Chapter 11 Page 156

But the government of King William was not then fully settled. It was in no condition to refuse anything to the country gentlemen, from whom it was at that very time soliciting the first establishment of the annual land-tax.

The value of silver, therefore, in proportion to that of corn, had probably risen somewhat before the end of the last century; and it seems to have continued to do so during the course of the greater part of the present; though the necessary operation of the bounty must have hindered that rise from being so sensible as it otherwise would have been in the actual state of tillage.

In plentiful years the bounty, by occasioning an extraordinary exportation, necessarily raises the price of corn above what it otherwise would be in those years.