Advertising spend being too high is a symptom of a supply glut. Too many products in the marketplace, not enough consumers to buy them.
In a different world where there are higher wages, more people would have more spending power. Then companies wouldn't have to spend as many dollars on advertising, which they could split between higher wages, higher margins and lower prices.
Alas, the short-term single-firm directional incentive for company decision makers in that world leads to marginal prioritization of higher margins. The loss of wages leads to loss of consumer spending power but it's spread across the economy. But every firm has the same incentive so they all do the same thing, and the good thing gets ruined.
This line of thinking leads to a Georgist-ish conclusion: The class conflict shouldn't be between workers and employers. They should be allies; the real cause of nobody being able to afford anything is rent extractors. (Writing in the 1800's, George [1] was most concerned about land rents; but the advertising monopoly of Google / Meta may be another form of extractive rent with similar characteristics.)
Maybe Henry Ford was on to something when he shocked the world by paying his employees enough to afford the product they were making (more than doubling many workers' wages)...
[1] https://www.astralcodexten.com/p/your-book-review-progress-a...