Among his many achievements as a distinguished historian and methodologist of economics, Richard Arena[aut]Arena, Richard is one of the principle contributors to the interpretation of the interaction between Piero Sraffa[aut]Sraffa, Pieroand Ludwig Wittgenstein[aut]Wittgenstein, Ludwig, and as such has helped make this interaction an important subject of investigation regarding the boundaries and connections between economics and philosophy in the Classical surplusSurplus approach.