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For a postback , the implementation evaluates the expression during apply request values , process validations , and update model phases , during which the value is retrieved from the request , validated , and propagated to the book bean . To restate the outcome , the sellers of low quality used cars will voluntarily , honestly admit that their used cars are of low quality and only worth $ 5,000 . In that game , a single airball ( see Google , again ) can hand you a major loss . During this phase , the expression merely accesses the value of quantity from the book bean , as is done in immediate evaluation . Unfortunately , in that game , the odds are stacked against you . It is not from the benevolence of the butcher , the brewer , or the baker that we expect our dinner , but from their regard to their own interest .