Welcome to the forum Sam and thanks for the interesting thread.
Sam:The following are ideas I have read about, rather than my position. I do think they merit consideration, but I haven't reached a conclusion yet. (I just thought I'd clear that up so I don't get labelled an anti-Austrian!)
your concern is whether whether praxeology is sufficient to explain economic phenomena.
Sam:Thinking about the economy, we basically conceive of human action on the one hand and institutions and social structure on the other (language, law and money are especially important). Praxeology explains the origins of institutions (money for example) as a result of human action. This seems valid, but two issues arise:
The term used for institutions and related issues was thymology.
Sam:1) Human action does not explain the origin of all institutions this way. Some institutions (presumably language) and co-operation would be necessary for the emergence of trade. These institutions, alongside human action, are a part of the explanation.
Perhaps we should define what institutions actually are. Something is institutionalized when it is repeated action and generally accepted by a group of people in a way. This can include many things like authority figures, social roles, habits, concepts, values, norms, practices, rules and the like. Language is an institutions in the way that it is repetetive and commonly accepted in terms of meaning and rules. Money is an institution given it's general acceptance as a means of payment.
Sam:2) In market activity we draw on pre-existing institutions, such as money and law. These institutions may be explained completely by earlier human action, or they may have drawn on other pre-existing institutions (see previous point). Either way, the explanation consists of something more than just human action.
There need to be rules of exchange for a market to work. Money can come in later as a generally acceted means of exchange. It is then accepted, because you know other people are going to accept it as payment.
Sam:More generally human action and social structure are best understood as being recursively related. They are both a cause (a necessary condition) and a consequence of the other.
Social structure in what sense? Human action of course can lead to social structure (or institutions in general) as well as given social structure and relationships can be an input to subsequent human action.
Sam:Does this present a problem for praxeology? How would you answer?
As said the concept of thymology would deal with the institutional part. Human action as such depends on several factors. One would be that their is an agent able to act, with other words a perceiving being that can make conscious decisions and has the power to realize them. Human action requires perception, interpretation, thinking, willing and execution. Perception are inputs from the outside world that are sensed and interpreted. Here ones organic set up and ideas on the mind are already a factor. For decvisions will power and valuation do play an important role. Again what and how we think as well as our desires will be of importance. Finally execution would draw on previous practices as well and their are of course boundaries in reality to what can be executed and what not.