A demand schedule is a table that portrays the quantity demanded of a good at different price levels.
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A supply schedule is a graph showing the amount of a product that is supplied at various prices.
Real world example: Cole papers has to make a supply and demand chart so they know how much paper they need to produce so they can keep up with demand.
Supply and Demand charts are important because companies need to know how much of a product they need to produce. Without these charts, not enough supplies or too much supplies would be bad for the company.