SupposenextthatA’stenthousandpounds，insteadofbeing
lenttoB，arelentonmortgagetoC，alandedproprietor，by
whomtheyareemployedinimprovingtheproductivepowersofhis
estate，byfencing，draining，road—making，orpermanentmanures。
Thisisproductiveemployment。Thetenthousandpoundsaresunk，