The golden cross is a technical indicator that occurs when a stock's 50-day moving average crosses above its 200-day moving average. This is generally considered a bullish signal, suggesting that the stock's long-term trend may be changing. In the case of Costco Wholesale, the appearance of a golden cross could lead to increased investor interest and potentially higher stock prices in the short term. However, it's important to note that seasoned investors use this signal as a starting point for further analysis, considering other factors such as price levels, company fundamentals, and events before making investment decisions.