An increase in the price of ink will shift the supply curve for pens to the left.

Supply Curve

A graphical representation of the quantity of goods that producers are willing to sell at different prices.

Ink

A pigment or dye-based fluid used for writing, printing, or drawing, comprised of various chemical compositions depending on its intended use.

Pens

Writing instruments used for applying ink to a surface, typically paper, for writing or drawing.