13. income effect: a change in quantity demanded when the consumers income changes
14. conversely: in exchange
15. substitutes: competing products that can be used in place of each other
16. change in demand: a shift of the whole demand curve to right or left
17. determinants: causes/shifters
18. consumer tastes: what buyers want, in demand
19. related: similar, alike
20. expectations: what should happen, predictions
21. refund: money returned
22. complements: products that affect each other in prices and demand
