Suppose Spencer and Kate are the only two demanders of lemonade. Each month, Spencer buys six glasses of lemonade when the price is $1.00 per glass, and he buys four glasses when the price is $1.50 per glass. Each month, Kate buys four glasses of lemonade when the price is $1.00 per glass, and she buys two glasses when the price is $1.50 per glass. Which of the following points is on the market demand curve? 
Definitions:
Intrinsic Motivation
A drive to engage in activities for their own sake, deriving pleasure and satisfaction from the activity itself rather than from external rewards.
For Its Own Sake
Undertaking an activity for the pleasure and value derived directly from the activity itself, rather than for achieving an external goal.
Biologically Determined
Refers to traits, behaviors, or conditions that are influenced by genetic makeup rather than the environment.
Instinct
An innate, typically fixed pattern of behavior in animals in response to certain stimuli that is primarily genetically coded.
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