First thing first, a secondary subject does not have to be a single object like a human being. The concept can be understood in a wider sense. Here, the rows of tees are taken as the secondary subjects.
In fact, a repetitive pattern is a good choice to serve as a secondary subject for its ability to add grist to the composition and the emotional appeal of an image. This is very much in line with what a secondary subject should do to an image. The rows of tees compress the spatial dimension of the image while gradually channel and fix the viewers' attention on the vendors. Although the tees occupy most of the scene, the vendors as the primary subjects break the repetitive pattern to become the centre of interest.
A close-up shot of the vendors doing away with the tees would be boring and leave less room for the viewers' imaginations, which speaks volumes for the importance of secondary subjects to a photo.
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