A careless research assistant has presented her professor with the following unlabeled equation representing the market for tea bags:
Q = 600 - 7K + 3R - 4Y. The professor then spends numerous hours trying to figure out what the equation represents. Which one of the following is a plausible best guess?
It is a supply function where K represents the price of tea bags.
It is a supply function where R represents the cost of the tea leaves.
It is a demand function where Y represents the price of coffee, a substitute in consumption for tea.
It is a demand function where K represents consumer income and tea bags are a normal good.
It is a demand function where R represents the number of people in the market.