The statement that best captures the law of supply and demand is:
"All things being equal, the higher the price of a good or service, the lower the demand will be for that good or service."
This reflects the inverse relationship between price and demand, which is a key principle of the law of demand. Additionally, the law of supply states that all things being equal, the higher the price, the more of a good or service suppliers will be willing to produce and offer for sale. However, the correct answer focuses on demand specifically.