The vertical axis of a demand curve shows the price of a product. the supply of a product. the interest in a product. the production cost of a product.

a. The price of a product.

The demand curve is a graphical representation of a demand function of a product.  

It depicts the quantity demanded of a product at each price level. We normally plot the quantity demanded on the horizontal or X axis and the price on the vertical or Y axis.

Since the consumers demand more of a product at lower prices and lesser number of units at higher prices, the demand curve slopes down.

the price of a product

Explanation:

someone i feel is a leader in my life id have to say would be my mother because she has give me great advice in life and got me out of tough situations. some characteristics she has are creativity, honesty, commitment, respect for others, and communication. one example of a situation when she demonstrated leadership was when i was working late on homework and i started to get stressed and got upset, she asked me if i needed some , and she me with my work. she demonstrated communication and commitment.

i don't know if this is exactly what your looking for but i hope this !