What thoughts i have of you tonight, walt whitman, for i walked down the sidestreets under the trees with a headache self-conscious looking at the full moon. why does the author most likely use free verse for this stanza?

The author uses the long-line structure.

Explanation:

Free verse poem is a poem which has no particular rhyme or rhythm. The author Allen Ginsberg’s in the poem "A Supermarket in California" uses long line structure. He uses free verse poem. The long-line structure imitates stream-of-conscious thought.

Stream of conscious means when one image leads to other. In the poem he uses this in a poetic style. The poem is about a guy who walks on the street, goes to supermarket and looks at people. While doing this he also calls upon a guy, Walt Whitman, who is also an outcast like the poet.

the switch in narration increases the proximity of the narrator to the main character and the reader can perceive information only through the filter of a single character.