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:
Primary Osteoporosis
A condition characterized by a decrease in bone density and strength, leading to an increased risk of fractures, occurring without an identifiable secondary cause.
Estrogen Deficiency
A condition marked by lower than normal levels of estrogen, a key hormone in female reproductive health.
Sedentary Lifestyle
A way of life involving little to no physical activity, significantly increasing the risk of various health issues.
Vitamin D
A fat-soluble vitamin that is important for maintaining bone health and supporting immune system function.
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