Scarce Resources + Unlimited Wants
Scarce resources mean there are fewer things to make goods + services desired. Limited, finite. Restricts which goods can be made.
Unlimited wants = desire for anything consumer wants, even if they don't have resources to purchase it. There are too many different uses for the resources. (competing uses)
Once a resource is used for one purpose, it is often used up and can't be used for anything else.