Marginalism claims that costs will rise if and when any additional cost is required to produce the next unit. 

Social Credit is the cost accounting fact that costs as a rate of flow throughout the entirety of the productive/economic process exceed the rate of flow of total individual incomes distributed and/or actually available to liquidate those costs. As the cost accounting convention that all costs must go into price is enforced on all enterprises….costs and thus prices will rise.

In other words marginalism is a flawed, incorrect and incomplete aspect of the system while Social Credit’s insight is a universal empirical micro-economic reality and thus a macro-economic/systemic one as well.