Supply & Demand 

Supply & Demand

The Theory of Economics does not furnish a body of settled conclusions

immediately applicable to policy. It is a method rather than a

doctrine, an apparatus of the mind, a technique of thinking, which

helps its possessor to draw correct conclusions. It is not difficult

in the sense in which mathematical and scientific techniques are

difficult; but the fact that its modes of expression are much less

precise than these, renders decidedly difficult the task of conveying

it correctly to the minds of learners.