Ok, I realise this seems like a stupidly simple question, but my attempts at coming to grips with the Marxian labour theory of value are running aground because of not finding a suitable answer.
So what defines an action as being Labour as opposed to something else?
The only definition I can find is that labour is that action which creates use-value. However, when it comes to determining the value of a commodity we are told that it is due to the amount of labour contained in it.
So the value of a commodity is derived from the amount of value creating substance (labour) in it. Which is so obvious that it doesn't seem worth saying. Isn't this circular logic? How can a tautology like this be of any use to anyone?
Secondly, without defining an operational definition of labour, how can one determine that the actions of a CEO who organises a production process isn't in fact a component part of the value embodies in the final commodity? Why does the labour of a factory worker count towards value, and the organisation labour of a CEO not count?
I hope I don't come across as a troll because that is not why I am here. I genuinely want to understand.
Thanks
Edited to add:
The LTV as I understand it is analogous to a 'Fart Theory of Smell' in which I define 'Fart' as that action that creates 'Smell', and that the Smell of an object is derived from the amount of Fart contained in it.
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For Marx's purposes in the labour theory of value, he is talking about productive average, socially necessary, labour.
Productive -
http://www.marxists.org/archive/marx/works/1864/economic/ch02b.htm
Average, socially necessary - so it's not how hard, or how long, the individual worker works, but rather the average intensity/time, assuming the best socially available configuration of technology, tools, materials, etc. for the industry.