a young culture so willingly bombarded with messages equating what one consumes with who one is that brand loyalty is now an acceptable synecdoche of identity, of character

they necessarily make extensive use of synecdoche

In On Populist Reason, hegemony is conceived in the form of synecdoche. Synecdoche is a rhetorical figure that consists in taking the part for the whole or conversely (it involves a form of metonymy).

He was fond of an autobiographical synecdoche: when interviewed, he said that an important thread running through his work began with a book review he found in his uncle Szolem’s wastepaper basket

The coin here might be read as a material allegory, or in some sense a synecdoche (a small part which represents the whole) of capital itself.

whether, in other words, rap is a stereotype or a synecdoche?

In this regard, the PowerPoint chapter, “Great Rock and Roll Pauses,” works as a synecdoche for the entire novel, where gaps, pauses, and strict formatting rules define each slide.