The problem with economics (capitalism) is that it assumes that the man is pursuing self-interest (the rational man). The problem with communism (Marxism) is that it assumes that the man is not pursuing self-interest.
The fundamental idea of a business is to convert a dollar into more than a dollar. Generally, how well a business is doing that is measured by net earnings or free cash flow. I am not clear on how one values a business as a multiple of revenue which seems to be a new norm for the new tech businesses.