416 Mr. JVimpey on the Impropriety cf allowing 
expectation of their being fubfervient to public 
good ; if they are found not to anfwer that pur- 
pofe, they fhould be execrated and abandoned 
as public evils, as appears by the foregoing pro¬ 
portions. 
5. Cheap and dear arc relative terms; and 
are meafured or eftimated, by their rife or fall 
above the medium value. The medium value 
of things may be eftimated, at the price they 
Hand the grower, the breeder, or the manufac¬ 
turer in, with a reafonable profit on the fame, 
for the maintenance of himfelf and family, 
be the commodity whatever it may. If it 
deviates from that ftandard, it will be dear, 
in proportion to its advance above it, or cheap, 
as it falls below it. But cheap and dear, being 
relative terms, they muft depend on fomething 
elfe for their exiftence; and this is very well 
known to be fcarcity and plenty. If the demand 
for any commodity is encreafed, beyond the quan¬ 
tity adequate to the fupply, its price is necef- 
farily advanced. But if the quantity exceeds 
the demand, the price as necelTarily falls; and 
it is not in human power to prevent it. From 
hence follows: 
6. Propofition. Whatever meafure, rule, or 
law, increafes the quantity of any commodity, 
in proportion to the demand for it, neceflarily 
makes it cheaper*, and whatever increafes the 
demand, 
