Refer to the graphs showing the demand for music downloads. The effect of an increase in the price of music downloads on consumers is best shown by arrow: 
Definitions:
Marginal Rate of Substitution
How quickly a consumer agrees to trade one good for another, aiming to keep their level of pleasure steady.
Edgeworth Box
A diagram used in economics to show the distribution of resources, illustrating how different mixes of goods can lead to an optimal allocation.
Competitive Equilibrium
A state in a competitive market where supply equals demand, and the market clears at a price where no participant has an incentive to change their behavior.
Total Value
The complete worth of a good, service, asset, or investment, often taking into account both tangible and intangible factors.
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