Exhibiting parsimony; sparing in expenditure of money; frugal to excess; penurious; niggardly; stingy.
having extreme frugality. In regard to phylogenetic trees, having the fewest assumptions or branches.
Stingy. Although in normal language, this has a negative connotation, when applied to a model or an explanation in economics it tends to be positive, meaning that it relies on as simple a structure as possible.
excessively unwilling to spend; "parsimonious thrift relieved by few generous impulses"; "lived in a most penurious manner--denying himself every indulgence"
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