มิวโกวิช และเจอร์รี่(Milkovich and Jerry) (2002) กล่าวว่าPay MixAdjustments to the different forms of pay competitors use (base, bonus, stock, benefits) and the relative importance they place on each form occur less frequently than adjustments to overall pay level. It is not clear (without good research) why changes to the pay mix occur less frequently than changes in the pay level. Perhaps the high costs of redesigning a different mix create a barrier. Perhaps inertia prevails. More likely, insufficient attention has been devoted to mix decisions. That is, the mix organizations government regulations, union demands, and what others did. Yet some pay forms may affect employee behavior more than others. O good information on total compensation, the mix of pay competitor use, and cost of various pay forms is increasingly important.” (หน้า213)