Maria purchases a premium brand of coffee at the grocery store for $8. which would be considered a substitute good?

A substitute good is one that can satisfy the same need as another. In this way, in the eyes of the consumer, the substitute good can replace the function of another, whether or not they are similar in terms of their characteristics or price. Substitute services behave in the same way. We consider that one good is a substitute for another when it is able to satisfy the same need of the consumer.  

Given the above, some substitute goods for Premium brand of coffee are 1. Value brand of coffee 2. Tea in any of its flavors 3. Water 4. Soda 5. Cocoa.

most people such as me i dont have one but if   i did i would mostly likely quit my job if the economy was down cylcling that means less money if you go to a bigger job that is prospering you can earn more wage and still be able to feed yourself or why you work all people want more money then they have guarteed most people like me would switch jobs for a better one with higher wage