What view of marriage does Shaw imply through Higgins's and Eliza's comments in this act ?

In this pivotal act, the relationship between Eliza and Higgins finally explodes. It is revealed that there has been a deeper feeling between them, and the fact that he has given her a ring certainly suggests a promise of marriage. This act also expresses Shaw's deepest condemnation of society, which is fleshed out more fully in Mrs. Warren's profession; that is, he puts in Eliza's words the idea that societal marriage is nothing better than the exchange of sex for money like what one sees among prostitutes. Eliza, if not also Shaw, views the upper-class marriage market as more degraded than her previous profession of selling flowers. From a class perspective, at least, her opinion expresses Shaw's deep socialism, supporting the claim that the working classes can and often do have more dignity than the hypocritical segments of the upper class.