What is Dwight Macdonald essentially saying in his essay entitled "A Theory of Mass Culture"?

Dwight
Macdonald was an American social critic born into an upper-class family in Brooklyn, New
York.

One of his prominent essays A Theory of Mass Culture (1957) bemoans
the decline of highbrow art. Before the 20th century, highbrow art was inaccessible to the
majority of the population as art was expressed as the singular vision of one artist.
Additionally, the educated could only fully understand highbrow art because literacy and
knowledge of artistic movements was necessary.

As the 20th century proceeded,
art became more accessible to the masses as more people were able to gain an education. The
style of art also moved from projecting a vision to highlighting common items. Macdonald hated
this change in subject matter as he believed art was becoming a product of an industry or a
society, and this almost mechanical nature of creating art made it kitsch.

In order to become a successful artist, one might simply need to create a product to be sold
for the masses....