Why always two goods?

Varieties of Austrian Price Theory
- Highlight Loc. 239-42  | Added on Wednesday, November 23, 2011, 07:30 PM

Chap. 5, p. 71 and passim: The remainder of this chapter I hold to be virtually totally in error. Why, for example, suddenly concentrate on two goods and their marginal utilities? Why not concentrate on one? What are advantages or justification of considering two, and not more or less? (There are obvious advantages for fancy graphs, but this is a mathematical, not an economic, justification.)