In this paper four versions of differential demand systems are compared empirically: namely, the Rotterdam system, a version of the Almost Ideal Demand (AID) system, the Central Bureau of Statistics (CBS) system, and the NBR system. These systems share common right-hand sides but differ in the...

Falsification of nontrivial empirical statements, of a statistical nature or not, is basically destructive. No wonder that it is rarely practiced. Rather than then abandoning a rejected null hypothesis, one tries to salvage it by looking for reasons why the rejection of an otherwise credible,...