Final answer:
Readership ad scores in magazines usually increase with the size of the ad because larger ads are more visible and can contain more engaging content, thus attracting more attention.
Step-by-step explanation:
Readership ad scores in magazines increase in proportion to the size of the ad. This is because larger ads are more noticeable and have more space for engaging content, which can attract more attention from readers. The size of an ad can indeed affect its visibility and impact, often leading to higher readership scores compared to smaller ads.
While factors like color, novelty, and cost may also influence the effectiveness of an advertisement, size is typically a primary determinant in the context of physical ad placements in magazines.