Demand for a product is most likely to decrease because

A decrease in the number of buyers

Explanation:

And if there are less customers, and no one wants to purchase your stuff, you would have a greater supply but less demand for your products.

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.