Possible Effects of Numeric Ability and Strategy Use on Recall of Prices.

<p>Three possible models of the effects of numeric ability and strategy use on recall of prices. Top: under-additive model, wherein the positive impacts of strategy use are reduced at higher levels of numeric ability. Middle: additive model, wherein strategy users and non-strategy users benefit equally from higher levels of numeric ability. Bottom: over-additive model, wherein the benefits of strategy use are enhanced at higher levels of numeric ability.