Using data on population to represent households. In this case the data on population is serving as a market proxy. Read below about market proxy.
A market proxy is a representation of an overall market, such as the stock market. A market proxy can serve as the basis for an index fund or statistical studies. Consequently, when the particular information needed in real estate market analysis does not exist one can try to find a variable to represent the missing data such variable is known as market proxy.
Therefore, the correct answer is market proxy.
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