With regard to customer defection, which of the following statements is incorrect?

A、Defectionratesaredeterminedbycustomerloyalty.;
B、Thelongeracompanyholdsontoacustomer,thegreateristhevolumeofcustomer-generatedunitsales.;
C、Loweringcustomerdefectionratescreatesahighercoststructure.;
D、Thelongeracompanyretainsacustomerthehighertheaverageunitcostofeachsale.;
E、Thereisapositiverelationshipbetweenthelengthoftimethatacustomerstayswiththecompanyandprofitpercustomer.