Gil
--- Since it remains the case that capitalist exploitation may exist without the capitalist mode of production, both on the authority of Roemer's formal argument and Marx's oft-repeated historical argument, and that such exploitation *necessarily* involves the non-equivalence of prices and values,Paul ---- Usury does not involve non-equivalence of prices and values since it is a purely monetary transaction.
Mercantile profit depends on the existence of different relative prices in different countries, something which is outside of the scope of analysis in Vol I.
Where is your necessity?