 Shares of eBay Inc. EBAY, -2.65 were falling 2.5 in Tuesday morning trading after UBS analyst Kunal Madhukar downgraded the stock to neutral from buy, writing of growth concerns regarding the online marketplace. Expectations are low, with non-Focus categories declining and with Focus categories, which are doing better, comprising purely discretionary spend which could be disproportionately impacted in a downturn, Madhukar wrote in a note to clients. 