For those looking to find strong Retail-Wholesale stocks, it is prudent to search for companies in the group that are outperforming their peers. Is Groupon (GRPN) one of those stocks right now? A quick glance at the company's year-to-date performance in comparison to the rest of the Retail-Wholesale sector should help us answer this question.Groupon is one of 212 companies in the Retail-Wholesale group. The Retail-Wholesale group currently sits at #13 within the Zacks Sector Rank. The Zacks Sector Rank cons ...