An estimate determined by market research of how many people read a single issue of a publication, such as four readers per copy, is known as the

Pass-along readership.

Explanation:

An estimate determined by market research of how many people read a single issue of a publication, such as four readers per copy, is known as the Pass-along readership.

Generally, the total audience of a publication such as a journal, newspaper, magazine etc is a sum total of its active, non-active subscribers and its pass-along readership.

Pass-along readership refers to a situation where a reader doesn't buy a publication themselves but reads it a copy of the publication when the buyer is done.

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