As part of the United States Census, data is also collected on the number of persons in each household.The census data for four decades is summarized below. 
Definitions:
Price Range
The spectrum of prices at which a particular product is sold in the market, from the lowest to the highest.
Price Elasticity
The measure of how much the quantity demanded of a good responds to a change in the price of that good, indicating the sensitivity of consumers to price changes.
Substitutes
Products or services that can replace each other in use or consumption, thereby affecting consumer choices and market dynamics.
Product
An item or service that is created through a process and is offered for sale or use.
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