We study optimal contracting by a monopolistic seller of investment goods to a time‐inconsistent consumer and, in doing so, introduce asymmetric information to the model of DellaVigna and Malmendier (2004). We find (1) the below‐marginal‐cost‐pricing rule may fail for a low‐value consumer; (2) the firm's profit is no longer unaffected by the consumer's short‐run impatience, as the latter is sophisticated. We find that there is an important threshold value of short‐run patience. When the consumer's short‐term patience is below this level, then, as the patience increases, the firm suffers. When the consumer's short‐run patience is above this threshold, then, as it increases, the firm benefits. Finally, we show that unlike monopoly, perfect competition with asymmetric information achieves the first‐best outcome. (JEL D03, D82, D91)