vitÂ·riÂ·fy (vÄ­tâ²rÉ-fÄ«â²) v. vitÂ·riÂ·fied, vitÂ·riÂ·fyÂ·ing, vitÂ·riÂ·fies v.tr. To change or make into glass or a glassy substance, especially through heat fusion. v.intr. To become vitreous.
We draw a demand curve to show the relationship between the price of the good and the quantity that consumers are willing to buy. For example, suppose people are willing to buy 20 pounds of strawberries at a price of $2, but are willing to buy 30 pounds if the price falls to $1.
This is, in essence, what goes on behind a demand curve. Above you see an example of a demand schedule. It shows us how many units (quantity) of a good will be demanded at a given price. The above schedule gives us a linear demand curve, because for every $10 the price goes up, quantity goes down by 20. We can use this schedule to plot the following points on a graph. Since we know that the curve is linear, we can just connect these points to get our demand curve (we could also connect the points if it wasnât linear, it just wouldnât be as exact).