There is an asymmetry in the risk/reward ratio between being long or being short in the stock market. (Being long means owning a stock, being short means selling a stock one does not own.)
Being long has unlimited potential on the upside but limited exposure on the downside. Being short is the reverse. The asymmetry manifests itself in the following way: losing on a long position reduces one's risk exposure while losing on a short position increases it. As a result, one can be more patient being long and wrong than being short and wrong. The asymmetry serves to discourage the short-selling of stocks.