[roel_v]

While that's true at the most abstract level, that doesn't mean that there isn't a whole lot one can learn beyond that, for example on recognizing customer archetypes, how to talk to each archetype to gain pathos with them, how to approach new clients, how to handle objections, how (and when) to close, ... So I would definitely say that there is something like sales, and yes it revolves around 'providing solutions', but that doesn't mean that anyone who can provide solutions to problems can bring in revenue.

Carnegie is a useful book for life in general, don't get me wrong - it's just that it's only the 'foundation' of sales and there is a big distance between that foundation and the actual practice of doing sales. Much like algebra is a 'foundation' of programming, yet nobody gets hired to program based on their ability to multiple two numbers.