You produce a glittering crystal substance, Dementia, which looks just like a diamond, but is much cheaper. It soon takes over 70 percent of the diamond market. Dementia is a:

substitute goods

Explanation:

Substitute goods -

It refers to the cheaper and better quality goods and services , which can be used in place of another product , is referred to as a substitute goods .

These goods can be better than the other one , as the goods might be easily available , lesser price , better quality , more durable , and hence has more demand by the consumers .

Hence , from the given scenario of the question ,

The correct answer is substitute goods .

c

explanation:

well obviously you must be dumb if you dont noe dat

its kinda hard to answer this when we dont have all the information that we need.