Interesting to hear peoples thoughts on this. If you know what I am talking about it will become obvious that this arc might/could end soon. Hard to say with stocks like costco because of their obvious growth nature. In fact, might be more positive during these financial times using costco for bulk/saving money vs others. In general some studies show that parabolic arcs typically retrace 62%.
Of course CostCo is a great/money saving company. However, what goes up must come down. The best stocks/ BTC all do at some point. Any news or bad PR I could see COST getting demolished due to the parabolic nature on the monthly cart.