7. What is a commercial effect of traditional graffiti?

Analysis:

The question asks about the commercial effect of traditional graffiti. While Text A defines street art and mentions its relationship to graffiti and vandalism, and Text B discusses the rise of graffiti, neither text specifically details the *commercial effects* of *traditional graffiti*. Text A mentions that street art is used to 'separate public-space artwork from illegal graffiti and vandalism,' which is more about categorization than commercial impact. Text D mentions Banksy's works being exhibited in galleries, hinting at commercialization, but this is more about contemporary street art than traditional graffiti's commercial effects.

Answer: The provided texts do not specifically detail the commercial effects of traditional graffiti.