I shall endeavor to show that induction is really the inverse process of deduction. - William Stanley Jevons

By a commodity we shall understand any object, substance, action or service, which can afford pleasure or ward off pain.

I consider that interest is determined by the increment of produce which it enables a labourer to obtain, and is altogether independent of the total return which he receives for this labour.

There are many portions of economical doctrine which appear to me as scientific in form as they are consonant with facts.