This basic economic theory states that when there is a relationship between supply and demand.

The relationship is as follows: the amount available and the desire of buyers for it, regulates price.

O+ blood can be given to over 80% of patients who require blood.

Since only about 38% of the U.S. population is type O+, there’s often not enough O+ blood available to meet patient needs.

The demand is greater than the supply.

Will you help fill it?

Photo by Jay Wennington on Unsplash.