Is the top portion or bottom portion of the curve of the pipe.
An increase in demand is represented by a shift of the demand curve to the right; not a movement along the demand curve. An increase in the quantity demanded would be a movement down the demand curve.
oligopoly
Shift of the curve to the left.
the middle curve
Graphic are represented using geometrical primitives such as lines, points, curve, shapes or polygons.
by a shift to the right of the demand curve
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It would not shift the curve; it would be represented by moving from a point inside the curve toward the curve.
An increase in quantity supplied is represented by demand.
A perfectly competitive firm's supply curve is that portion of its marginal cost curve that lies above the minimum of the average variable cost curve.
Contour Map