When you need a blood transfusion, you can freely access blood through a blood bank. However, the availability of that blood is dependent on the donations of people who do not necessarily need the blood. This is an example of a

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This scenario is an example of a public goods dilemma, where the availability of a resource (blood) depends on voluntary contributions (donations) from individuals, and everyone can benefit from it regardless of whether they have contributed.

When You Need a Blood Transfusion, You Can Freely Access