The Wealth of Nations by Part 1 Chapter 11 Page 228

If, notwithstanding a great rise in their price, it still continues to prevail through a considerable part of the country, it is owing, in many places, no doubt, to ignorance and attachment to old customs, but in most places to the unavoidable obstructions which the natural course of things opposes to the immediate or speedy establishment of a better system: first, to the poverty of the tenants, to their not having yet had time to acquire a stock of cattle sufficient to cultivate their lands more completely, the same rise of price which would render it advantageous for them to maintain a greater stock rendering it more difficult for them to acquire it; and, secondly, to their not having yet had time to put their lands in condition to maintain this greater stock properly, supposing they were capable of acquiring it.