A market researcher for a cable company is seeking to determine the number of households in a selected neighborhood that consists of four or more people. The most cost-efficient way to collect this information would be to:

Obtain census information available on the internet,

Explanation:

The number of households in the neighbourhood must have been captured during census and uploaded on the census board website or those of relevant agencies.

A visit to such websites to get the number of households in the neighbourhood of interest is very cost-efficient as the only thing that the market researcher needs to do is to have just internet subscription package which can be obtained for an extreme lesser fee when compared to paying the households visits, transporting to and fro and replenishing lost energy by buying food or taking energy drinks.

The most cost-efficient way for this market researcher will be to look through the internet.

Explanation:

Using the internet to check will be the most convenient and most cost-efficient way to get the widespread agreement among the people as it will not only reduce the hassle but also avoid delays.