Oxygen (O₂) and ozone (O₃) coexist in the stratosphere and are in equilibrium with one another: 
a) Assuming that no other factors affect this equilibrium, if ozone ( 
) is being "depleted" (somehow removed from the reaction system entirely), what is the direction of the equilibrium shift?
b) What must be happening to the concentration of oxygen ( 
) as a result of the equilibrium shift predicted in part a?
Definitions:
Indifference Curve
A graph that shows different combinations of two goods or services among which a consumer is indifferent, illustrating preferences and trade-offs.
Total Utility
The total satisfaction received from consuming a certain amount of goods or services.
Marginal Rate of Substitution
The rate at which a consumer is willing to give up one good in exchange for another good, while keeping overall utility constant.
Substitution Effect
A shift in consumer behavior as a result of alterations in the comparative costs of products, resulting in the replacement of one product for another.
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