We examined whether the extent to which individuals accord importance to components of the investment model varies by attachment. In Study 1, rewards and costs in a hypothetical relationship were experimentally manipulated, and participants (single and dating undergraduates) reported perceptions of rewards, costs, and satisfaction. In Study 2, investments and alternative quality were manipulated, and participants reported perceptions of investments, alternatives, satisfaction, and commitment. Study 1 revealed that relative to others, individuals high in both anxiety and avoidance (i.e., fearful) accord less weight to rewards when determining satisfaction. Study 2 revealed that relative to others, individuals low in anxiety and high in avoidance (i.e., dismissing) accord more weight to investments and alternatives, and less weight to satisfaction when determining commitment. Copyright © 2013 John Wiley & Sons, Ltd.