Final answer:
The subject of this question is Health. When someone's kidneys fail, they require medical treatment with a dialysis machine or transplant, and the supply of dialysis machines affects the price.
Step-by-step explanation:
The subject of this question is Health.
When someone's kidneys fail, they require medical treatment with a dialysis machine or a kidney transplant. To illustrate that the supply of such dialysis machines determines the price, we can use a supply and demand diagram. The supply of dialysis machines is crucial in determining the cost of treatment.