in the supply and emand curves, i know that the price is where the two intersect, but how do you determine the individual prices of each supply

Economics Economics Questions
1

eg

http://tutor2u.net/economics/gcse/images/demand_supply_excess_demand1.gif

how do you know that a certain supply cost .35 and another costs .25

i’m not talking about the price of the final item

but looking at each curve in itself

sorry if it sounds like a rivolous question

2

your question is of the form: how does one X

the simple answer: you don’t.

or trivially, because the person that drew you the graph is asking you to assume they are right.

3

You don’t know, just likely you can never know what any curve looks like. In fact, the very notion of a demand or supply “curve” is, correctly applied, a pedagogical tool. Unfortunately, many economists have forgotten this. In reality, there is no curve, there is merely a number of points that will never be known, are always changing and can only be revealed through action. In the case of the demand curve, if these points were to be joined up the resulting line would be downward sloping, or horizontal, depending on the elasticity of the curve. Conversely, for the supply curve it would either be upwards sloping or horizontal, most likely the former. To say otherwise is to say that goods are infinitely indivisible and even more absurd that small portions of goods are the object of human action, they cannot be.

Now, as already noted, these curves should not be anything more than a tool for highlighting the fundamental praxeological insight that at at higher price fewer goods will be demanded and more will be supplied, and that the amount of goods supplied will be where the two goods meet. Unfortunately, the mainstream has found it worthwhile to manipulate these curves in various ways so as to please their peers and make elegant models that have little resemblance to reality.