We now use our panel data on sellers' feedback records. We begin in this subsection by examining the impact of negative feedback on the seller's sales rate. Our typical seller receives his first negative during the early stages of his career. During this period, sales rates are typically increasing over time. To account for the possibility of growth rates varying with age, we first regress each seller's weekly growth rates on the seller's `age,' as measured by total transactions completed on eBay until that time. We also use as regressors age squared and indicators for different object categories. In what follows, when we refer to weekly growth rates, we mean age-detrended weakly growth rates, that is, the residual from the above regression