a(n) is a tangible product, something we can see, touch, smell, hear, taste, or possess.

The answer is good. A good is any tangible thing, which is not classified as money nor real estate. It is considered to be a service, or a physical, tangible object/product, which pleases an individual’s wants or needs, or even something that an individual find beneficial or desirable and makes an effort to acquire it that product/service.

answer; the best answer is (demand);