demand---Collection of
points each indicating quantity of a particular good or basket of goods that a
person, or group of people would like to have at each corresponding “price”, at
a particular point in time. Generally, unless people are under rather heavy budget
constraints, at which point the actual money they do have becomes dearer to
them, they will buy more of something as the price becomes lower, and hence the
demand curve is a negatively sloped function. It may move around quite a bit
through time. Price is stationed on the y-axis instead of on the x-axis (which
is normally used for the independent variable) by the founder of modern
economics, Professor Alfred Marshall.
Please see equilibrium, supply, UTILITY CURVES AND AGGREGATE DEMAND